Implement organized media folder structure for community posts

- Add media_folder field to Post model for organized file storage
- Create MediaConfig class for centralized media management settings
- Update community routes to use post-specific media folders
- Add thumbnail generation for uploaded images
- Implement structured folder layout: app/static/media/posts/{post_folder}/
- Add utility functions for image and GPX file handling
- Create media management script for migration and maintenance
- Add proper file validation and MIME type checking
- Include routes for serving images, thumbnails, and GPX files
- Maintain backward compatibility with existing uploads
- Add comprehensive documentation and migration tools

Each post now gets its own media folder with subfolders for:
- images/ (with thumbnails/ subfolder)
- gpx/

Post content remains in database for optimal query performance while
media files are organized in dedicated folders for better management.

config.py

@@ -8,10 +8,19 @@ class Config:
     SQLALCHEMY_DATABASE_URI = os.environ.get('DATABASE_URL') or 'sqlite:///moto_adventure.db'
     SQLALCHEMY_TRACK_MODIFICATIONS = False
     
-    # File Upload Configuration
+    # Media Configuration - Updated for new media system
+    MEDIA_FOLDER = os.environ.get('MEDIA_FOLDER') or 'app/static/media/posts'
+    MAX_CONTENT_LENGTH = int(os.environ.get('MAX_CONTENT_LENGTH') or 16 * 1024 * 1024)  # 16MB
+    
+    # Image Processing
+    IMAGE_MAX_WIDTH = int(os.environ.get('IMAGE_MAX_WIDTH') or 1920)
+    IMAGE_MAX_HEIGHT = int(os.environ.get('IMAGE_MAX_HEIGHT') or 1080)
+    IMAGE_QUALITY = int(os.environ.get('IMAGE_QUALITY') or 85)
+    THUMBNAIL_SIZE = int(os.environ.get('THUMBNAIL_SIZE') or 300)
+    
+    # Legacy - keeping for backward compatibility
     UPLOAD_FOLDER = os.environ.get('UPLOAD_FOLDER') or 'app/static/uploads'
-    MAX_CONTENT_LENGTH = 16 * 1024 * 1024  # 16MB max file size
-    ALLOWED_EXTENSIONS = {'png', 'jpg', 'jpeg', 'gif', 'gpx'}
+    ALLOWED_EXTENSIONS = {'png', 'jpg', 'jpeg', 'gif', 'webp', 'gpx'}
     
     # Email Configuration
     MAIL_SERVER = os.environ.get('MAIL_SERVER') or 'smtp.gmail.com'