Integrate complete Candidat platform with ASP.NET chatbot service

- Added Next.js frontend for candidate interviews
- Added Node.js backend with TypeScript and AI integration
- Added ASP.NET Core chatbot service for specialized AI conversations
- Added MySQL database with complete schema
- Added Nginx reverse proxy configuration
- Complete Docker Compose orchestration for all services
- Environment configuration for production, development, and Cloudflare
- Comprehensive documentation and setup instructions
- Flattened nested folder structures for clean organization
- Integrated chatbot service with fallback to direct AI calls

backend/.gitignore

@@ -0,0 +1,61 @@
+### Node template
+.DS_Store
+# Logs
+logs
+*.log
+npm-debug.log*
+
+# Runtime data
+pids
+*.pid
+*.seed
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+
+# Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (http://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directory
+# https://docs.npmjs.com/misc/faq#should-i-check-my-node-modules-folder-into-git
+node_modules
+.npmrc
+*.log
+
+# Typings
+typings/
+
+# Typescript
+/**/*.js
+/**/*.js.map
+test/**/*.js
+test/**/*.js.map
+
+# Test
+/.tmp
+/.nyc_output
+
+# IDE
+.vscode
+.idea
+
+# Project
+/public
+/dist
+
+# Environment variables
+.env
+.env.local
+.env.development
+.env.production
+.env.test
+.env.*.local