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/models/task.py

@@ -1,6 +1,6 @@
 """Collection Task model"""
 
-from sqlalchemy import Column, DateTime, Integer, String, Text
+from sqlalchemy import Column, DateTime, Integer, String, Text, Float
 from sqlalchemy.sql import func
 
 from app.db.session import Base
@@ -15,6 +15,8 @@ class CollectionTask(Base):
     started_at = Column(DateTime(timezone=True))
     completed_at = Column(DateTime(timezone=True))
     records_processed = Column(Integer, default=0)
+    total_records = Column(Integer, default=0)  # Total records to process
+    progress = Column(Float, default=0.0)  # Progress percentage (0-100)
     error_message = Column(Text)
     created_at = Column(DateTime(timezone=True), server_default=func.now())