Add comprehensive TypeScript support and conversion

- Convert entire backend to TypeScript with strict type checking
- Add comprehensive type definitions and interfaces
- Create typed models for Location and ProfanityWord with database operations
- Convert all services to TypeScript (DatabaseService, ProfanityFilterService)
- Convert all API routes with proper request/response typing
- Add TypeScript build system and development scripts
- Update package.json with TypeScript dependencies and scripts
- Configure tsconfig.json with strict typing and build settings
- Update CLAUDE.md documentation for TypeScript development
- Add .gitignore rules for TypeScript build artifacts

Architecture improvements:
- Full type safety throughout the application
- Typed database operations and API endpoints
- Proper error handling with typed exceptions
- Strict optional property handling
- Type-safe dependency injection for routes

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

Co-Authored-By: Claude <noreply@anthropic.com>

.gitignore

@@ -30,3 +30,12 @@ Thumbs.db
 # Generated files
 public/style.css
 public/style.css.map
+
+# TypeScript build outputs
+dist/
+
+# TypeScript compiled files in src (should only be in dist/)
+src/**/*.js
+src/**/*.js.map
+src/**/*.d.ts
+src/**/*.d.ts.map