feat: Extract hardcoded configs to environment variables

- Add environment variable configuration for backend and frontend
- Backend: DB_POOL_SIZE, JWT_EXPIRE_HOURS, timeout configs, directory paths
- Frontend: VITE_API_BASE_URL, VITE_UPLOAD_TIMEOUT, Whisper configs
- Create deployment script (scripts/deploy-backend.sh)
- Create 1Panel deployment guide (docs/1panel-deployment.md)
- Update DEPLOYMENT.md with env var documentation
- Create README.md with project overview
- Remove obsolete PRD.md, SDD.md, TDD.md (replaced by OpenSpec)
- Keep CORS allow_origins=["*"] for Electron EXE distribution

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

backend/.env.example

@@ -1,16 +1,69 @@
+# =============================================================================
+# Meeting Assistant Backend Configuration
+# Copy this file to .env and fill in your values
+# =============================================================================
+
+# -----------------------------------------------------------------------------
+# Server Configuration
+# -----------------------------------------------------------------------------
+# Host address to bind (0.0.0.0 for all interfaces)
+BACKEND_HOST=0.0.0.0
+# Port number to listen on
+BACKEND_PORT=8000
+
+# -----------------------------------------------------------------------------
 # Database Configuration
+# -----------------------------------------------------------------------------
 DB_HOST=mysql.theaken.com
 DB_PORT=33306
-DB_USER=A060
+DB_USER=your_username
 DB_PASS=your_password_here
-DB_NAME=db_A060
+DB_NAME=your_database
+# Connection pool size (default: 5)
+DB_POOL_SIZE=5
 
+# -----------------------------------------------------------------------------
 # External APIs
+# -----------------------------------------------------------------------------
+# Company authentication API endpoint
 AUTH_API_URL=https://pj-auth-api.vercel.app/api/auth/login
+# Dify API base URL
 DIFY_API_URL=https://dify.theaken.com/v1
+# Dify LLM API key (for summarization)
 DIFY_API_KEY=app-xxxxxxxxxxx
+# Dify STT API key (for audio transcription)
 DIFY_STT_API_KEY=app-xxxxxxxxxxx
 
-# Application Settings
-ADMIN_EMAIL=ymirliu@panjit.com.tw
+# -----------------------------------------------------------------------------
+# Authentication Settings
+# -----------------------------------------------------------------------------
+# Email address with admin privileges
+ADMIN_EMAIL=admin@example.com
+# JWT signing secret (use a strong random string in production)
 JWT_SECRET=your_jwt_secret_here
+# JWT token expiration time in hours (default: 24)
+JWT_EXPIRE_HOURS=24
+
+# -----------------------------------------------------------------------------
+# Timeout Configuration (in milliseconds)
+# -----------------------------------------------------------------------------
+# File upload timeout (default: 600000 = 10 minutes)
+UPLOAD_TIMEOUT=600000
+# Dify STT transcription timeout per chunk (default: 300000 = 5 minutes)
+DIFY_STT_TIMEOUT=300000
+# Dify LLM processing timeout (default: 120000 = 2 minutes)
+LLM_TIMEOUT=120000
+# Authentication API timeout (default: 30000 = 30 seconds)
+AUTH_TIMEOUT=30000
+
+# -----------------------------------------------------------------------------
+# File Configuration
+# -----------------------------------------------------------------------------
+# Template directory path (leave empty for default: ./template)
+# TEMPLATE_DIR=/path/to/templates
+# Record output directory path (leave empty for default: ./record)
+# RECORD_DIR=/path/to/records
+# Maximum upload file size in bytes (default: 524288000 = 500MB)
+MAX_FILE_SIZE=524288000
+# Supported audio formats (comma-separated)
+SUPPORTED_AUDIO_FORMATS=.mp3,.wav,.m4a,.webm,.ogg,.flac,.aac