v0.12.0 - Add modular system architecture with user-based module access

- Add Modules and UserModules database tables
- Create home page with module selection grid
- Implement per-user module assignment in user management
- Add route guards for module access control
- Refactor navigation: login -> home -> modules, admin console via button
- Add Font Awesome icons

database/init_db.py

@@ -31,7 +31,36 @@ def init_database():
         created_timestamp DATETIME DEFAULT CURRENT_TIMESTAMP
     )
     ''')
-    
+
+    # Modules Table - defines available system modules
+    cursor.execute('''
+    CREATE TABLE IF NOT EXISTS Modules (
+        module_id INTEGER PRIMARY KEY AUTOINCREMENT,
+        module_name TEXT UNIQUE NOT NULL,
+        module_key TEXT UNIQUE NOT NULL,
+        description TEXT,
+        icon TEXT,
+        is_active INTEGER DEFAULT 1,
+        display_order INTEGER DEFAULT 0
+    )
+    ''')
+
+    # UserModules Table - which modules each user can access
+    cursor.execute('''
+    CREATE TABLE IF NOT EXISTS UserModules (
+        user_module_id INTEGER PRIMARY KEY AUTOINCREMENT,
+        user_id INTEGER NOT NULL,
+        module_id INTEGER NOT NULL,
+        granted_by INTEGER,
+        granted_timestamp DATETIME DEFAULT CURRENT_TIMESTAMP,
+        FOREIGN KEY (user_id) REFERENCES Users(user_id),
+        FOREIGN KEY (module_id) REFERENCES Modules(module_id),
+        FOREIGN KEY (granted_by) REFERENCES Users(user_id),
+        UNIQUE(user_id, module_id)
+    )
+    ''')
+
+
     # CountSessions Table
     # NOTE: current_baseline_version removed - CURRENT is now global
     cursor.execute('''