Implement configuration-based mod management and fix navigation spacing

## Major Features Added

### Configuration-Based Mod Management
- Implement proper Luanti mod system using load_mod_* entries in world.mt
- Add mod enable/disable via configuration instead of file copying
- Support both global mods (config-enabled) and world mods (physically installed)
- Clear UI distinction with badges: "Global (Enabled)", "World Copy", "Missing"
- Automatic registry verification to sync database with filesystem state

### Game ID Alias System
- Fix minetest_game/minetest technical debt with proper alias mapping
- Map minetest_game → minetest for world.mt files (matches Luanti internal behavior)
- Reference: c9d4c33174/src/content/subgames.cpp (L21)

### Navigation Improvements
- Fix navigation menu spacing and text overflow issues
- Change "Configuration" to "Config" for better fit
- Implement responsive font sizing with clamp() for better scaling
- Even distribution of nav buttons across full width

### Package Registry Enhancements
- Add verifyAndCleanRegistry() to automatically remove stale package entries
- Periodic verification (every 5 minutes) to keep registry in sync with filesystem
- Fix "already installed" errors for manually deleted packages
- Integration across dashboard, ContentDB, and installation workflows

## Technical Improvements

### Mod System Architecture
- Enhanced ConfigParser to handle load_mod_* entries in world.mt files
- Support for both configuration-based and file-based mod installations
- Proper mod type detection and management workflows
- Updated world details to show comprehensive mod information

### UI/UX Enhancements
- Responsive navigation with proper text scaling
- Improved mod management interface with clear action buttons
- Better visual hierarchy and status indicators
- Enhanced error handling and user feedback

### Code Quality
- Clean up gitignore to properly exclude runtime files
- Add package-lock.json for consistent dependency management
- Remove excess runtime database and log files
- Add .claude/ directory to gitignore

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

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

utils/config-parser.js

@@ -85,6 +85,15 @@ class ConfigParser {
       }
     }
     
+    // Extract mod configurations
+    config.enabled_mods = {};
+    for (const [key, value] of Object.entries(config)) {
+      if (key.startsWith('load_mod_')) {
+        const modName = key.replace('load_mod_', '');
+        config.enabled_mods[modName] = value === 'true';
+      }
+    }
+    
     return config;
   }
 
@@ -98,6 +107,14 @@ class ConfigParser {
       }
     }
     
+    // Handle mod configurations
+    if (configCopy.enabled_mods) {
+      for (const [modName, enabled] of Object.entries(configCopy.enabled_mods)) {
+        configCopy[`load_mod_${modName}`] = enabled.toString();
+      }
+      delete configCopy.enabled_mods; // Remove the helper object
+    }
+    
     await this.writeConfig(filePath, configCopy);
   }