Dynamic paths for tools and removal of unused book endpoints (#3018)

# Description of Changes

This pull request includes several changes primarily focused on
improving configuration management, removing deprecated methods, and
updating paths for external dependencies. The most important changes are
summarized below:

### Configuration Management Improvements:
* Added a new `RuntimePathConfig` class to manage dynamic paths for
operations and pipeline configurations
(`src/main/java/stirling/software/SPDF/config/RuntimePathConfig.java`).
* Removed the `bookAndHtmlFormatsInstalled` bean and its associated
logic from `AppConfig` and `EndpointConfiguration`
(`src/main/java/stirling/software/SPDF/config/AppConfig.java`,
`src/main/java/stirling/software/SPDF/config/EndpointConfiguration.java`).
[[1]](diffhunk://#diff-4d774ec79aa55750c0a4739bee971b68877078b73654e863fd40ee924347e143L130-L138)
[[2]](diffhunk://#diff-750f31f6ecbd64b025567108a33775cad339e835a04360affff82a09410b697dL12-L35)
[[3]](diffhunk://#diff-750f31f6ecbd64b025567108a33775cad339e835a04360affff82a09410b697dL275-L280)

### External Dependency Path Updates:
* Updated paths for `weasyprint` and `unoconvert` in
`ExternalAppDepConfig` to use values from `RuntimePathConfig`
(`src/main/java/stirling/software/SPDF/config/ExternalAppDepConfig.java`).
[[1]](diffhunk://#diff-c47af298c07c2622aa98b038b78822c56bdb002de71081e102d344794e7832a6R12-L33)
[[2]](diffhunk://#diff-c47af298c07c2622aa98b038b78822c56bdb002de71081e102d344794e7832a6L104-R115)


### Minor Adjustments:
* Corrected a typo from "Unoconv" to "Unoconvert" in
`EndpointConfiguration`
(`src/main/java/stirling/software/SPDF/config/EndpointConfiguration.java`).

---

## Checklist

### General

- [ ] I have read the [Contribution
Guidelines](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/CONTRIBUTING.md)
- [ ] I have read the [Stirling-PDF Developer
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/DeveloperGuide.md)
(if applicable)
- [ ] I have read the [How to add new languages to
Stirling-PDF](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/HowToAddNewLanguage.md)
(if applicable)
- [ ] I have performed a self-review of my own code
- [ ] My changes generate no new warnings

### Documentation

- [ ] I have updated relevant docs on [Stirling-PDF's doc
repo](https://github.com/Stirling-Tools/Stirling-Tools.github.io/blob/main/docs/)
(if functionality has heavily changed)
- [ ] I have read the section [Add New Translation
Tags](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/HowToAddNewLanguage.md#add-new-translation-tags)
(for new translation tags only)

### UI Changes (if applicable)

- [ ] Screenshots or videos demonstrating the UI changes are attached
(e.g., as comments or direct attachments in the PR)

### Testing (if applicable)

- [ ] I have tested my changes locally. Refer to the [Testing
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/DeveloperGuide.md#6-testing)
for more details.

src/main/java/stirling/software/SPDF/utils/FileMonitor.java

@@ -3,6 +3,9 @@ package stirling.software.SPDF.utils;
 import static java.nio.file.StandardWatchEventKinds.*;
 
 import java.io.IOException;
+import java.io.RandomAccessFile;
+import java.nio.channels.FileChannel;
+import java.nio.channels.FileLock;
 import java.nio.file.*;
 import java.util.*;
 import java.util.concurrent.ConcurrentHashMap;
@@ -15,7 +18,8 @@ import org.springframework.scheduling.annotation.Scheduled;
 import org.springframework.stereotype.Component;
 
 import lombok.extern.slf4j.Slf4j;
-import stirling.software.SPDF.config.InstallationPathConfig;
+
+import stirling.software.SPDF.config.RuntimePathConfig;
 
 @Component
 @Slf4j
@@ -35,7 +39,9 @@ public class FileMonitor {
      *     monitored, false otherwise
      */
     @Autowired
-    public FileMonitor(@Qualifier("directoryFilter") Predicate<Path> pathFilter)
+    public FileMonitor(
+            @Qualifier("directoryFilter") Predicate<Path> pathFilter,
+            RuntimePathConfig runtimePathConfig)
             throws IOException {
         this.newlyDiscoveredFiles = new HashSet<>();
         this.path2KeyMapping = new HashMap<>();
@@ -43,7 +49,7 @@ public class FileMonitor {
         this.pathFilter = pathFilter;
         this.readyForProcessingFiles = ConcurrentHashMap.newKeySet();
         this.watchService = FileSystems.getDefault().newWatchService();
-        this.rootDir = Path.of(InstallationPathConfig.getPipelineWatchedFoldersDir());
+        this.rootDir = Path.of(runtimePathConfig.getPipelineWatchedFoldersPath()).toAbsolutePath();
     }
 
     private boolean shouldNotProcess(Path path) {
@@ -162,6 +168,37 @@ public class FileMonitor {
      * @return true if the file is ready for processing, false otherwise
      */
     public boolean isFileReadyForProcessing(Path path) {
-        return readyForProcessingFiles.contains(path);
+        // 1. Check FileMonitor's ready list
+        boolean isReady = readyForProcessingFiles.contains(path.toAbsolutePath());
+
+        // 2. Check last modified timestamp
+        if (!isReady) {
+            try {
+                long lastModified = Files.getLastModifiedTime(path).toMillis();
+                long currentTime = System.currentTimeMillis();
+                isReady = (currentTime - lastModified) > 5000;
+            } catch (IOException e) {
+                log.info("Timestamp check failed for {}", path, e);
+            }
+        }
+
+        // 3. Direct file lock check
+        if (isReady) {
+            try (RandomAccessFile raf = new RandomAccessFile(path.toFile(), "rw");
+                    FileChannel channel = raf.getChannel()) {
+                // Try acquiring an exclusive lock
+                FileLock lock = channel.tryLock();
+                if (lock == null) {
+                    isReady = false;
+                } else {
+                    lock.release();
+                }
+            } catch (IOException e) {
+                log.info("File lock detected on {}", path);
+                isReady = false;
+            }
+        }
+
+        return isReady;
     }
 }

src/main/java/stirling/software/SPDF/utils/FileToPdf.java

@@ -23,10 +23,10 @@ import stirling.software.SPDF.utils.ProcessExecutor.ProcessExecutorResult;
 public class FileToPdf {
 
     public static byte[] convertHtmlToPdf(
+            String weasyprintPath,
             HTMLToPdfRequest request,
             byte[] fileBytes,
             String fileName,
-            boolean htmlFormatsInstalled,
             boolean disableSanitize)
             throws IOException, InterruptedException {
 
@@ -49,29 +49,12 @@ public class FileToPdf {
             }
 
             List<String> command = new ArrayList<>();
-            if (!htmlFormatsInstalled) {
-                command.add("/opt/venv/bin/weasyprint");
-                command.add("-e");
-                command.add("utf-8");
-                command.add("-v");
-                command.add(tempInputFile.toString());
-                command.add(tempOutputFile.toString());
-            } else {
-                command.add("ebook-convert");
-                command.add(tempInputFile.toString());
-                command.add(tempOutputFile.toString());
-                command.add("--paper-size");
-                command.add("a4");
-
-                if (request != null && request.getZoom() != 1.0) {
-                    File tempCssFile = Files.createTempFile("customStyle", ".css").toFile();
-                    try (FileWriter writer = new FileWriter(tempCssFile)) {
-                        writer.write("body { zoom: " + request.getZoom() + "; }");
-                    }
-                    command.add("--extra-css");
-                    command.add(tempCssFile.getAbsolutePath());
-                }
-            }
+            command.add(weasyprintPath);
+            command.add("-e");
+            command.add("utf-8");
+            command.add("-v");
+            command.add(tempInputFile.toString());
+            command.add(tempOutputFile.toString());
 
             ProcessExecutorResult returnCode =
                     ProcessExecutor.getInstance(ProcessExecutor.Processes.WEASYPRINT)

src/main/java/stirling/software/SPDF/utils/GeneralUtils.java

@@ -28,6 +28,7 @@ import io.github.pixee.security.HostValidator;
 import io.github.pixee.security.Urls;
 
 import lombok.extern.slf4j.Slf4j;
+
 import stirling.software.SPDF.config.InstallationPathConfig;
 
 @Slf4j

src/main/java/stirling/software/SPDF/utils/PDFToFile.java

@@ -26,6 +26,7 @@ import com.vladsch.flexmark.util.data.MutableDataSet;
 import io.github.pixee.security.Filenames;
 
 import lombok.extern.slf4j.Slf4j;
+
 import stirling.software.SPDF.utils.ProcessExecutor.ProcessExecutorResult;
 
 @Slf4j

src/main/java/stirling/software/SPDF/utils/PdfUtils.java

@@ -35,6 +35,7 @@ import org.springframework.web.multipart.MultipartFile;
 import io.github.pixee.security.Filenames;
 
 import lombok.extern.slf4j.Slf4j;
+
 import stirling.software.SPDF.service.CustomPDDocumentFactory;
 
 @Slf4j

src/main/java/stirling/software/SPDF/utils/ProcessExecutor.java

@@ -12,6 +12,7 @@ import java.util.concurrent.TimeUnit;
 import io.github.pixee.security.BoundedLineReader;
 
 import lombok.extern.slf4j.Slf4j;
+
 import stirling.software.SPDF.model.ApplicationProperties;
 
 @Slf4j

src/main/java/stirling/software/SPDF/utils/misc/CustomColorReplaceStrategy.java

@@ -23,6 +23,7 @@ import org.springframework.core.io.InputStreamResource;
 import org.springframework.web.multipart.MultipartFile;
 
 import lombok.extern.slf4j.Slf4j;
+
 import stirling.software.SPDF.model.api.misc.HighContrastColorCombination;
 import stirling.software.SPDF.model.api.misc.ReplaceAndInvert;
 

src/main/java/stirling/software/SPDF/utils/misc/ReplaceAndInvertColorStrategy.java

@@ -7,6 +7,7 @@ import org.springframework.web.multipart.MultipartFile;
 
 import lombok.Data;
 import lombok.EqualsAndHashCode;
+
 import stirling.software.SPDF.model.api.PDFFile;
 import stirling.software.SPDF.model.api.misc.ReplaceAndInvert;
 

src/main/java/stirling/software/SPDF/utils/propertyeditor/StringToArrayListPropertyEditor.java

@@ -9,6 +9,7 @@ import com.fasterxml.jackson.databind.DeserializationFeature;
 import com.fasterxml.jackson.databind.ObjectMapper;
 
 import lombok.extern.slf4j.Slf4j;
+
 import stirling.software.SPDF.model.api.security.RedactionArea;
 
 @Slf4j