…vent handling

- Added schemas for secrets, reveal conditions, and game events using Zod for validation.
- Developed SecretTools for creating, retrieving, updating, deleting, and revealing secrets.
- Implemented a repository pattern for managing secrets in a SQLite database.
- Introduced functionality to check reveal conditions based on game events.
- Added leak detection to prevent accidental disclosure of secrets.
- Enhanced context formatting for LLM integration to ensure DM confidentiality.

Introduces structure placement validation against terrain, preventing cities, towns, and villages from being placed in water or on glaciers. Adds new tools for finding and suggesting valid POI locations, and party movement/position tracking. Updates patch application logic to report errors and warnings, and extends party schema and server tool registration for world map positioning.