feat: add project file system with CRUD, upload, inline editing, and video attachment support

- Add new `/projects/{slug}/files` endpoint group for per-project filesystem operations including directory and file CRUD, upload, and inline editing with public read and owner write access
- Extend attachment system to support video formats (webm, ogv, mov, m4v) with proper file icons and MIME types
- Implement configurable allowed file types via `allowed_file_types` site setting, replacing hardcoded `ALLOWED_UPLOAD_TYPES` with dynamic `allowed_extensions()` and `is_extension_allowed()` functions
- Add `delete_all_project_files()` call in `delete_content_item()` to clean up project files when a project is deleted
- Create database indexes on `project_files` table for `(project_uid, path)` and `(project_uid, parent_path)` to optimize file lookups
- Introduce `docs_prose.py` module with `render_prose()` function that renders Markdown content inside `data-render` divs using mistune, enabling dynamic prose rendering in documentation pages
- Enhance docs search with Markdown-aware text stripping (`_demarkdown()`) and improved HTML/script/style sanitization for better search indexing
- Update documentation API samples to reflect new attachment response fields (`is_image`, `is_video`, `mime_type`) and note video format support
- Update README to document the new project files endpoint and clarify AI gateway attribution for guest Devii sessions

devplacepy/services/devii/cli.py

@@ -147,8 +147,8 @@ async def run(settings: Settings, prompt: Optional[str] = None) -> None:
     cost_tracker = CostTracker()
     chunk_store = ChunkStore()
     agentic = AgenticController(lessons, settings)
-    dispatcher = Dispatcher(CATALOG, client, settings, controller, agentic)
-    tools = CATALOG.tool_schemas_for(client.authenticated)
+    dispatcher = Dispatcher(CATALOG, client, settings, controller, agentic, is_admin=True)
+    tools = CATALOG.tool_schemas_for(client.authenticated, is_admin=True)
     agentic.bind(
         llm=llm, dispatcher=dispatcher, tools=tools,
         on_trace=_trace, cost_tracker=cost_tracker, chunk_store=chunk_store,