PDF Text editor (#4724)

## Summary
- add a `PdfJsonConversionService` that serializes PDF text, fonts, and
metadata to JSON and rebuilds a PDF from the same structure
- expose REST endpoints for `/pdf/json` and `/json/pdf` conversions
using the existing convert API infrastructure
- define JSON model classes capturing document metadata, font
information, and positioned text elements

## Testing
- `./gradlew spotlessApply` *(fails: plugin
org.springframework.boot:3.5.4 unavailable in build environment)*
- `./gradlew build` *(fails: plugin org.springframework.boot:3.5.4
unavailable in build environment)*

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https://chatgpt.com/codex/tasks/task_b_68f8e98d94ac8328a0e499e541528b6f

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Co-authored-by: EthanHealy01 <[email protected]>

frontend/src/core/data/toolsTaxonomy.ts

@@ -59,6 +59,10 @@ export type ToolRegistryEntry = {
 	supportsAutomate?: boolean;
 	// Synonyms for search (optional)
 	synonyms?: string[];
+	// Version status indicator (e.g., "alpha", "beta")
+	versionStatus?: "alpha" | "beta";
+	// Whether this tool requires premium access
+	requiresPremium?: boolean;
 }
 
 export type RegularToolRegistry = Record<RegularToolId, ToolRegistryEntry>;