[EXTRACT] LocationService - Rip location operations from monolith

[democratize-technology-code-reviewer]

🔪 Extraction Target

Extract all location operations from the 19,843-line index.mjs into a focused LocationService class. Straight extraction.

📁 Methods to Extract

// All of these get ripped out and moved to LocationService
getLocations()
getLocation()
createLocation()
updateLocation()
deleteLocation()
// ... and any other location-related methods

🎯 Definition of Done

• Create services/LocationService.js extending BaseService
• Extract ALL location methods from index.mjs
• File size < 500 lines (enforced by linter)
• All existing tests pass WITHOUT modification
• Add JSDoc comments for each method
• No deprecated methods or compatibility layers
• Update all imports/references in index.mjs
• Zero regression - identical functionality

⚡ Implementation

// services/LocationService.js
export class LocationService extends BaseService {
  async getLocations() {
    // Direct copy from index.mjs - no changes
  }
  
  async createLocation(location) {
    // Direct copy from index.mjs - no changes
  }
  
  // ... rest of location methods
}

🚫 NOT in Scope

• Backward compatibility
• Deprecation warnings
• Proxy methods in GrocyClient
• Changing method signatures
• Adding new features

💀 Breaking Changes

Yes. Progress.

Related to

Parent issue: #11