docs: refresh contributor docs and drop root requirements.txt

CONTRIBUTING.md caught up with reality: ruff not Black, Python 3.12,
sh.voicebox.app, the routes/services/backends layout, the actual
pytest + CI story, and a working autoupdater link. SECURITY.md now
says 0.5.x and describes what CI actually enforces. The root
requirements.txt was vestigial (unpinned, included torchvision,
referenced by nothing) — deleted, with two stale doc references
repointed at backend/requirements.txt. backend/pyproject.toml is now
covered by bumpversion; its version was stuck at 0.2.3 and is synced
to 0.5.0.

docs/content/docs/developer/contributing.mdx

@@ -258,20 +258,8 @@ When adding new API endpoints:
     ```
   </Step>
 
-  <Step title="Regenerate Client">
-    ```bash
-    just generate-api
-    ```
-
-    This updates the TypeScript client with type-safe bindings.
-  </Step>
-
-  <Step title="Update Docs">
-    The API documentation is automatically generated from the OpenAPI schema. Ensure your endpoint has proper docstrings and type hints, then regenerate the docs:
-    
-    ```bash
-    just generate-api
-    ```
+  <Step title="Update the Frontend Client">
+    The TypeScript client is hand-written. Add matching types to `app/src/lib/api/types.ts` and a method to `app/src/lib/api/client.ts`. The backend's live schema at `http://localhost:17493/docs` is the reference.
   </Step>
 </Steps>
 

docs/content/docs/developer/setup.mdx

@@ -32,7 +32,7 @@ Ensure you have these installed:
     curl -fsSL https://bun.sh/install | bash
     ```
   </Card>
-  <Card title="Python 3.11+" icon={<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round"><path d="M12 2L2 7l10 5 10-5-10-5z"/><path d="M2 17l10 5 10-5"/><path d="M2 12l10 5 10-5"/></svg>}>
+  <Card title="Python 3.12+" icon={<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round"><path d="M12 2L2 7l10 5 10-5-10-5z"/><path d="M2 17l10 5 10-5"/><path d="M2 12l10 5 10-5"/></svg>}>
     [Download Python](https://python.org)
     ```bash
     python --version
@@ -111,7 +111,6 @@ Run `just --list` to see all available commands. Highlights:
 
 | Command | Description |
 |---------|-------------|
-| `just generate-api` | Generate TypeScript API client from the backend's OpenAPI schema |
 | `just docs` | Open `http://localhost:17493/docs` in your browser |
 | `just logs` | Tail backend logs |
 | `just clean` | Remove build artifacts |
@@ -184,15 +183,9 @@ See [Model Management](/developer/model-management) for the full list.
   First-time usage will be slower due to model downloads, but subsequent runs will use cached models.
 </Callout>
 
-## Generate OpenAPI Client
+## Frontend API Client
 
-After starting the backend server, generate the TypeScript API client:
-
-```bash
-just generate-api
-```
-
-This downloads the OpenAPI schema and generates the TypeScript client in `app/src/lib/api/`.
+The TypeScript API client is hand-written: request/response types live in `app/src/lib/api/types.ts` and the fetch wrapper in `app/src/lib/api/client.ts`. When you add or change a backend endpoint, update both to match. The backend's live schema at `http://localhost:17493/docs` is the reference.
 
 ## Manual Setup (Advanced)
 
@@ -277,9 +270,9 @@ bun run tauri dev
 
 <AccordionGroup>
   <Accordion title="Backend won't start">
-    - Check Python version (must be 3.11+)
+    - Check Python version (must be 3.12+)
     - Ensure virtual environment is activated: `source backend/venv/bin/activate`
-    - Verify all dependencies are installed: `pip install -r requirements.txt`
+    - Verify all dependencies are installed: `pip install -r backend/requirements.txt`
     - Check if port 17493 is available
   </Accordion>
 

docs/content/docs/overview/troubleshooting.mdx

@@ -355,39 +355,6 @@ cd ../..
 bun run tauri build
 ```
 
-### OpenAPI Client Generation Fails
-
-**Symptoms:**
-- `./scripts/generate-api.sh` fails
-- "Failed to fetch schema" error
-
-**Solutions:**
-
-<Steps>
-  <Step title="Ensure Backend is Running">
-    ```bash
-    curl http://localhost:17493/openapi.json
-    ```
-
-    Should return JSON. If not, start the backend.
-  </Step>
-
-  <Step title="Check Port">
-    Ensure nothing else is using port 17493
-  </Step>
-
-  <Step title="Regenerate Manually">
-    ```bash
-    cd backend
-    source venv/bin/activate
-    uvicorn main:app --reload --port 17493
-
-    # In another terminal
-    ./scripts/generate-api.sh
-    ```
-  </Step>
-</Steps>
-
 ## Database Issues
 
 ### "Database is locked" Error