fix: configure ty type checker to find project dependencies

- Add python = ".venv" to [tool.ty.environment] in pyproject.toml
  This tells ty where to find installed dependencies when running
  in pre-commit's isolated environment

- Switch from local ty hook to ty-pre-commit remote hook
  Simplifies configuration and uses official ty pre-commit hook

- Add worktrees/ to .gitignore
  Prevents git worktree directories from being tracked

- Fix import ordering in exceptions.py (ruff auto-fix)
- Add type ignore comment in test_api_endpoints.py (ty fix)

This resolves ty type checker errors where it couldn't resolve
imports for dependencies like advanced_alchemy, sqlalchemy, etc.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: JacobCoffee

tests/integration/test_api_endpoints.py

@@ -364,7 +364,7 @@ async def test_concurrent_guild_creation_same_id(
         results = await asyncio.gather(*tasks, return_exceptions=True)
 
         # One should succeed (201), one should fail (409 or 500)
-        status_codes: list[int] = [r.status_code if hasattr(r, "status_code") else 500 for r in results]
+        status_codes: list[int] = [r.status_code if hasattr(r, "status_code") else 500 for r in results]  # type: ignore[misc]
         assert HTTP_201_CREATED in status_codes
         # At least one should indicate a conflict/error
         assert any(code >= 400 for code in status_codes)