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: https://github.com/luanti-org/luanti/blob/c9d4c33174c87ede1f49c5fe5e8e49a784798eb6/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>

public/css/style.css

@@ -144,18 +144,22 @@ body {
 
 .nav-item {
   flex: 1;
-  min-width: 140px;
+  min-width: 0;
 }
 
 .nav-link {
   display: block;
-  padding: 16px 20px;
+  padding: 14px 16px;
   text-decoration: none;
   color: var(--text-light);
   font-weight: bold;
   text-align: center;
   text-transform: uppercase;
-  letter-spacing: 1px;
+  letter-spacing: 0.5px;
+  font-size: clamp(0.75rem, 1.2vw, 0.9rem);
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
   transition: all 0.1s ease;
   border-right: var(--border-width) solid var(--border-dark);
   background: linear-gradient(180deg, 
@@ -679,14 +683,11 @@ body {
 }
 
 /* Responsive design */
-@media (max-width: 1024px) and (min-width: 769px) {
-  .nav-item {
-    min-width: 160px;
-  }
-  
+@media (max-width: 1200px) {
   .nav-link {
-    padding: 12px 16px;
-    font-size: 0.85rem;
+    padding: 12px 8px;
+    font-size: clamp(0.7rem, 1.1vw, 0.85rem);
+    letter-spacing: 0.3px;
   }
 }