docs: Update documentation with latest accomplishments and features

CHANGELOG.md

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+# Changelog
+
+All notable changes to the RAG Modulo project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+### Added
+- **Document Upload Pipeline**: Full document ingestion pipeline for collection creation
+  - New `/api/collections/with-files` endpoint for creating collections with documents
+  - New `/api/collections/{collection_id}/documents` endpoint for adding documents to existing collections
+  - Frontend `createCollectionWithFiles()` method in apiClient
+  - Automatic background processing with PipelineService integration
+
+- **Production Deployment Support**: Added Makefile targets for production deployment
+  - `make prod-start`: Start all services with docker-compose.production.yml
+  - `make prod-stop`: Stop production environment
+  - `make prod-restart`: Restart production environment
+  - `make prod-logs`: View production logs
+  - `make prod-status`: Check production service status
+
+### Changed
+- **Milvus Connection Stability**: Improved connection handling in MilvusStore
+  - Added explicit disconnection before reconnecting to prevent stale connections
+  - Fixes issues with connection caching when switching between hosts
+
+- **Local Development Workflow**: Enhanced Makefile for better developer experience
+  - Fixed frontend directory references (webui → frontend)
+  - Added log file outputs for easier debugging
+  - Updated process detection for react-scripts instead of vite
+  - Improved local development status reporting
+
+- **Frontend Configuration**: Updated for local development
+  - Changed proxy from `http://backend:8000` to `http://localhost:8000`
+  - Supports containerless local development workflow
+
+- **Collection Creation**: Enhanced error handling
+  - Added 409 Conflict response for duplicate collection names
+  - Proper AlreadyExistsError handling in collection router
+
+- **Frontend Collection Creation**: Improved UX for document uploads
+  - Real file upload instead of simulated progress
+  - Support for creating collections with initial documents
+  - Proper FormData handling for multi-file uploads
+
+### Fixed
+- **Collection Creation Modal**: Fixed document upload functionality
+  - Removed fake upload simulation
+  - Store actual File objects for upload
+  - Fixed drag-and-drop file handling
+  - Properly invoke document ingestion pipeline
+
+### Technical Debt
+- Removed log file modifications from git tracking (already in .gitignore)
+- Cleaned up orphaned log files (logs/rag_modulo.log.1, logs/rag_modulo.log.3)
+
+---
+
+## [Previous Releases]
+
+### [0.1.0] - 2025-09-30
+
+#### Major Features
+- Collection creation and management
+- Document processing and chunking
+- Vector store integration (Milvus)
+- Search functionality with CoT reasoning
+- Chat interface with WebSocket support
+- Dashboard analytics
+- Multi-provider LLM support (WatsonX, OpenAI, Anthropic)
+
+#### Infrastructure
+- Docker Compose orchestration
+- PostgreSQL for metadata
+- MLFlow for model tracking
+- MinIO for object storage
+- Comprehensive test suite (unit, integration, API, performance)
+- CI/CD pipeline with GitHub Actions
+
+---
+
+## Release Notes
+
+### Version Numbering
+- **Major version** (X.0.0): Breaking changes, major architectural updates
+- **Minor version** (0.X.0): New features, non-breaking changes
+- **Patch version** (0.0.X): Bug fixes, minor improvements
+
+### Categories
+- **Added**: New features
+- **Changed**: Changes to existing functionality
+- **Deprecated**: Soon-to-be removed features
+- **Removed**: Removed features
+- **Fixed**: Bug fixes
+- **Security**: Security fixes
+- **Technical Debt**: Code quality improvements