feat(UI): added docker image and config

.env.example

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+# BDFR Web Interface - Docker Environment Configuration
+# Copy this file to .env and update the values as needed
+
+# ============================================================================
+# REDDIT OAUTH CONFIGURATION (REQUIRED for authenticated features)
+# ============================================================================
+# Get these credentials from: https://www.reddit.com/prefs/apps
+# 
+# Steps to get OAuth credentials:
+# 1. Go to https://www.reddit.com/prefs/apps
+# 2. Click "Create App" or "Create Another App"
+# 3. Fill in:
+#    - Name: BDFR Web Interface (or your choice)
+#    - App type: Select "web app"
+#    - Redirect URI: http://localhost:8000/auth/callback
+# 4. Copy the client ID (under the app name) and client secret
+
+BDFR_CLIENT_ID=your_client_id_here
+BDFR_CLIENT_SECRET=your_client_secret_here
+
+# IMPORTANT: This MUST match your Reddit OAuth app's redirect URI exactly
+# If you change the port, update this accordingly
+BDFR_REDIRECT_URI=http://localhost:8000/auth/callback
+
+# ============================================================================
+# SERVER CONFIGURATION (Optional)
+# ============================================================================
+
+# Host to bind to (0.0.0.0 for all interfaces, 127.0.0.1 for localhost only)
+HOST=0.0.0.0
+
+# Port for the web interface
+PORT=8000
+
+# Enable debug mode (true/false) - DO NOT use in production
+DEBUG=false
+
+# ============================================================================
+# DOWNLOAD CONFIGURATION (Optional - Docker handles these by default)
+# ============================================================================
+
+# Directory where downloads will be stored (inside container)
+# This is mounted from ./downloads on the host
+BDFR_DOWNLOAD_DIR=/downloads
+
+# Directory for application data and databases (inside container)
+# This is mounted from ./data on the host
+BDFR_DATA_DIR=/app/data
+
+# ============================================================================
+# BDFR ADVANCED CONFIGURATION (Optional)
+# ============================================================================
+
+# BDFR configuration directory (inside container)
+# Default: /app/data/bdfr-config (stored in mounted data volume)
+# BDFR_CONFIG_DIR=/app/data/bdfr-config
+
+# Maximum wait time for rate limiting (in seconds)
+# Default: 120
+# BDFR_MAX_WAIT_TIME=120
+
+# Time format for {DATE} in filenames
+# Default: ISO 8601 format (%Y-%m-%dT%H:%M:%S)
+# BDFR_TIME_FORMAT=%Y-%m-%dT%H:%M:%S
+
+# File naming scheme
+# Available variables: {REDDITOR}, {SUBREDDIT}, {POSTID}, {UPVOTES}, {TITLE}, {DATE}, {FLAIR}
+# Default: {REDDITOR}_{TITLE}_{POSTID}
+# BDFR_FILE_SCHEME={REDDITOR}_{TITLE}_{POSTID}
+
+# Folder naming scheme
+# Default: {SUBREDDIT}
+# BDFR_FOLDER_SCHEME={SUBREDDIT}
+
+# Environment variables for BDFR config location
+# These tell BDFR where to store its configuration files
+# APPDATA=/app/data/bdfr-config
+# XDG_CONFIG_HOME=/app/data/bdfr-config
+
+# ============================================================================
+# DATABASE CONFIGURATION (Optional)
+# ============================================================================
+
+# SQLite database file paths (inside container)
+# These are stored in the mounted ./data directory
+# DATABASE_URL=sqlite:////app/data/scheduled_tasks.db
+# SCHEDULER_DATABASE_URL=sqlite:////app/data/scheduler_jobs.db
+
+# ============================================================================
+# LOGGING CONFIGURATION (Optional)
+# ============================================================================
+
+# Log level (DEBUG, INFO, WARNING, ERROR, CRITICAL)
+# LOG_LEVEL=INFO
+
+# Log file path (inside container)
+# LOG_FILE=/app/logs/bdfr-web.log
+
+# ============================================================================
+# SECURITY CONFIGURATION (Production Only)
+# ============================================================================
+
+# Secret key for session management
+# Generate a secure random string for production
+# SECRET_KEY=your-secret-key-here
+
+# Allowed hosts (comma-separated)
+# ALLOWED_HOSTS=localhost,127.0.0.1,bdfr.example.com
+
+# Enable CORS (true/false)
+# ENABLE_CORS=true
+
+# CORS allowed origins (comma-separated)
+# CORS_ORIGINS=http://localhost:8000,https://bdfr.example.com
+
+# ============================================================================
+# NOTES
+# ============================================================================
+# 
+# - After modifying this file, restart the Docker container:
+#   docker-compose restart
+# 
+# - For sensitive values in production, consider using Docker secrets:
+#   https://docs.docker.com/engine/swarm/secrets/
+# 
+# - Required variables are marked as REQUIRED
+# - Optional variables will use sensible defaults if not set
+# 
+# - For more information, see DOCKER.md