Update all dependencies for Python 3.14 full compatibility with flexible version ranges

requirements.txt

@@ -1,40 +1,40 @@
 # Core Framework
-Flask==3.0.0
-Werkzeug==3.0.1
+Flask>=3.0.0,<4.0.0
+Werkzeug>=3.0.0,<4.0.0
 
 # Database
-Flask-SQLAlchemy==3.1.1
-Flask-Migrate==4.0.5
-SQLAlchemy==2.0.23
+Flask-SQLAlchemy>=3.1.1,<4.0.0
+Flask-Migrate>=4.0.5,<5.0.0
+SQLAlchemy>=2.0.23,<3.0.0
 
 # Authentication
-Flask-Login==0.6.3
-Flask-Bcrypt==1.0.1
+Flask-Login>=0.6.3,<1.0.0
+Flask-Bcrypt>=1.0.1,<2.0.0
 
 # Forms & Validation
-Flask-WTF==1.2.1
-WTForms==3.1.1
-email-validator==2.1.0
+Flask-WTF>=1.2.1,<2.0.0
+WTForms>=3.1.1,<4.0.0
+email-validator>=2.1.1,<3.0.0  # Using 2.1.1+ to avoid yanked 2.1.0
 
 # HTTP Requests (for Brickset API)
-requests==2.31.0
-httpx==0.25.2
+requests>=2.31.0,<3.0.0
+httpx>=0.25.2,<1.0.0
 
-# File Handling
-Pillow>=11.0.0  # For image processing (updated for Python 3.14+ compatibility)
-PyPDF2==3.0.1
-PyMuPDF>=1.24.0  # For PDF thumbnail generation (updated for Python 3.14+ compatibility)
+# File Handling (Critical: These need Python 3.14 support)
+Pillow>=11.0.0  # Python 3.14+ compatible with prebuilt wheels
+PyPDF2>=3.0.1,<4.0.0
+PyMuPDF>=1.24.0  # Python 3.14+ compatible with prebuilt wheels
 
 # Environment Variables
-python-dotenv==1.0.0
+python-dotenv>=1.0.0,<2.0.0
 
 # Date/Time Utilities
-python-dateutil==2.8.2
+python-dateutil>=2.8.2,<3.0.0
 
 # Development & Testing
-pytest==7.4.3
-pytest-flask==1.3.0
-flask-debugtoolbar==0.14.1
+pytest>=7.4.3,<9.0.0
+pytest-flask>=1.3.0,<2.0.0
+flask-debugtoolbar>=0.14.1,<1.0.0
 
-# Production Server
-gunicorn==21.2.0
+# Production Server (Note: gunicorn doesn't work on Windows, use waitress instead)
+waitress>=2.1.2,<3.0.0  # Windows-compatible WSGI server