Change AI engine to execute tools in Java instead of on frontend (#6116)

# Description of Changes
Redesign AI engine so that it autogenerates the `tool_models.py` file
from the OpenAPI spec so the Python has access to the Java API
parameters and the full list of Java tools that it can run. CI ensures
that whenever someone modifies a tool endpoint that the AI enigne tool
models get updated as well (the dev gets told to run `task
engine:tool-models`).

There's loads of advantages to having the Java be the one that actually
executes the tools, rather than the frontend as it was previously set up
to theoretically use:
- The AI gets much better descriptions of the params from the API docs
- It'll be usable headless in the future so a Java daemon could run to
execute ops on files in a folder without the need for the UI to run
- The Java already has all the logic it needs to execute the tools 
- We don't need to parse the TypeScript to find the API (which is hard
because the TS wasn't designed to be computer-read to extract the API)

I've also hooked up the prototype frontend to ensure it's working
properly, and have built it in a way that all the tool names can be
translated properly, which was always an issue with previous prototypes
of this.

---------

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

engine/tests/test_pdf_edit_agent.py

@@ -12,14 +12,14 @@ from stirling.contracts import (
     PdfEditRequest,
     ToolOperationStep,
 )
-from stirling.models.tool_models import CompressParams, OperationId, RotateParams
+from stirling.models.tool_models import Angle, FlattenParams, RotatePdfParams, ToolEndpoint
 from stirling.services.runtime import AppRuntime
 
 
 @dataclass(frozen=True)
 class ParameterSelectorCall:
     request: PdfEditRequest
-    operation_plan: list[OperationId]
+    operation_plan: list[ToolEndpoint]
     operation_index: int
     generated_steps: list[ToolOperationStep]
 
@@ -31,10 +31,10 @@ class RecordingParameterSelector:
     async def select(
         self,
         request: PdfEditRequest,
-        operation_plan: list[OperationId],
+        operation_plan: list[ToolEndpoint],
         operation_index: int,
         generated_steps: list[ToolOperationStep],
-    ) -> RotateParams | CompressParams:
+    ) -> RotatePdfParams | FlattenParams:
         self.calls.append(
             ParameterSelectorCall(
                 request=request,
@@ -44,8 +44,8 @@ class RecordingParameterSelector:
             )
         )
         if operation_index == 0:
-            return RotateParams(angle=90)
-        return CompressParams(compression_level=5)
+            return RotatePdfParams(angle=Angle(90))
+        return FlattenParams(flatten_only_forms=False, render_dpi=None)
 
 
 class StubPdfEditAgent(PdfEditAgent):
@@ -73,7 +73,7 @@ async def test_pdf_edit_agent_builds_multi_step_plan(runtime: AppRuntime) -> Non
     agent = StubPdfEditAgent(
         runtime,
         PdfEditPlanSelection(
-            operations=[OperationId.ROTATE, OperationId.COMPRESS],
+            operations=[ToolEndpoint.ROTATE_PDF, ToolEndpoint.FLATTEN],
             summary="Rotate the PDF, then compress it.",
             rationale="The pages need reorientation before reducing file size.",
         ),
@@ -90,9 +90,9 @@ async def test_pdf_edit_agent_builds_multi_step_plan(runtime: AppRuntime) -> Non
     assert isinstance(response, EditPlanResponse)
     assert response.summary == "Rotate the PDF, then compress it."
     assert response.rationale == "The pages need reorientation before reducing file size."
-    assert [step.tool for step in response.steps] == [OperationId.ROTATE, OperationId.COMPRESS]
-    assert isinstance(response.steps[0].parameters, RotateParams)
-    assert isinstance(response.steps[1].parameters, CompressParams)
+    assert [step.tool for step in response.steps] == [ToolEndpoint.ROTATE_PDF, ToolEndpoint.FLATTEN]
+    assert isinstance(response.steps[0].parameters, RotatePdfParams)
+    assert isinstance(response.steps[1].parameters, FlattenParams)
 
 
 @pytest.mark.anyio
@@ -101,7 +101,7 @@ async def test_pdf_edit_agent_passes_previous_steps_to_parameter_selector(runtim
     agent = StubPdfEditAgent(
         runtime,
         PdfEditPlanSelection(
-            operations=[OperationId.ROTATE, OperationId.COMPRESS],
+            operations=[ToolEndpoint.ROTATE_PDF, ToolEndpoint.FLATTEN],
             summary="Rotate the PDF, then compress it.",
         ),
         parameter_selector=parameter_selector,
@@ -120,8 +120,8 @@ async def test_pdf_edit_agent_passes_previous_steps_to_parameter_selector(runtim
     assert parameter_selector.calls[1].operation_index == 1
     assert parameter_selector.calls[1].generated_steps == [
         ToolOperationStep(
-            tool=OperationId.ROTATE,
-            parameters=RotateParams(angle=90),
+            tool=ToolEndpoint.ROTATE_PDF,
+            parameters=RotatePdfParams(angle=Angle(90)),
         )
     ]