Added proper agents config for mcp servers and skills.

Added the menu category delete route.
Fix: Show blank vouchers in tables
Fix: In rare cases, the old settements can stick around. fixed it.

.agents/skills/fastapi-pydantic-v2/SKILL.md

@@ -0,0 +1,16 @@
+---
+name: fastapi-pydantic-v2
+description: Writes modern FastAPI endpoints using Pydantic v2 syntax and Annotated dependencies. Use whenever generating or refactoring API routes.
+---
+# FastAPI & Pydantic v2 Standards
+
+## Pydantic v2 Rules
+- NEVER use `.dict()` or `.json()`. ALWAYS use `.model_dump()` and `.model_dump_json()`.
+- NEVER use `@validator` or `@root_validator`. ALWAYS use `@field_validator` and `@model_validator(mode="before|after")`.
+- NEVER use `schema_extra`. Use `json_schema_extra` inside the `model_config` dict.
+- Use `pydantic_settings.BaseSettings` for all environment variable configurations.
+
+## FastAPI Rules
+- ALWAYS use `typing.Annotated` for dependency injection (e.g., `db: Annotated[AsyncSession, Depends(get_db)]`).
+- Do not use `def` for endpoints that perform I/O; always use `async def`.
+- Raise `fastapi.HTTPException` for expected client errors instead of returning standard dictionaries.