feat: add agent skills and guardrails functionality

- Introduced new tools for managing agent skills and guardrails, including add, remove, and list operations.
- Updated README.md to document new commands and usage patterns for skills and guardrails.
- Enhanced server configuration to support longer read and write timeouts.
- Increased maximum upload size for files to 100 MB and adjusted related configurations.
- Created database migrations for agent skills, guardrails, and their associations with projects.
- Updated relevant code files to integrate new skills and guardrails into the application logic.

internal/app/app.go

@@ -173,6 +173,7 @@ func routes(logger *slog.Logger, cfg *config.Config, db *store.DB, provider ai.P
 		Calendar:      tools.NewCalendarTool(db),
 		Meals:         tools.NewMealsTool(db),
 		CRM:           tools.NewCRMTool(db),
+		Skills:        tools.NewSkillsTool(db, activeProjects),
 	}
 
 	mcpHandler := mcpserver.New(cfg.MCP, toolSet)