feat(backend): Add cable graph service and data collectors

## Changelog

### New Features

#### Cable Graph Service
- Add cable_graph.py for finding shortest path between landing points
- Implement haversine distance calculation for great circle distances
- Support for dateline crossing (longitude normalization)
- NetworkX-based graph for optimal path finding

#### Data Collectors
- Add ArcGISCableCollector for fetching submarine cable data from ArcGIS GeoJSON API
- Add FAOLandingPointCollector for fetching landing point data from FAO CSV API

### Backend Changes

#### API Updates
- auth.py: Update authentication logic
- datasources.py: Add datasource endpoints and management
- visualization.py: Add visualization API endpoints
- config.py: Update configuration settings
- security.py: Improve security settings

#### Models & Schemas
- task.py: Update task model with new fields
- token.py: Update token schema

#### Services
- collectors/base.py: Improve base collector with better error handling
- collectors/__init__.py: Register new collectors
- scheduler.py: Update scheduler logic
- tasks/scheduler.py: Add task scheduling

### Frontend Changes
- AppLayout.tsx: Improve layout component
- index.css: Add global styles
- DataSources.tsx: Enhance data sources management page
- vite.config.ts: Add Vite configuration for earth module

backend/app/services/collectors/__init__.py

@@ -24,6 +24,8 @@ from app.services.collectors.cloudflare import (
     CloudflareRadarTrafficCollector,
     CloudflareRadarTopASCollector,
 )
+from app.services.collectors.arcgis_cables import ArcGISCableCollector
+from app.services.collectors.fao_landing import FAOLandingPointCollector
 
 collector_registry.register(TOP500Collector())
 collector_registry.register(EpochAIGPUCollector())
@@ -39,3 +41,5 @@ collector_registry.register(TeleGeographyCableSystemCollector())
 collector_registry.register(CloudflareRadarDeviceCollector())
 collector_registry.register(CloudflareRadarTrafficCollector())
 collector_registry.register(CloudflareRadarTopASCollector())
+collector_registry.register(ArcGISCableCollector())
+collector_registry.register(FAOLandingPointCollector())