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/core/config.py

@@ -12,8 +12,8 @@ class Settings(BaseSettings):
     API_V1_STR: str = "/api/v1"
     SECRET_KEY: str = "your-secret-key-change-in-production"
     ALGORITHM: str = "HS256"
-    ACCESS_TOKEN_EXPIRE_MINUTES: int = 15
-    REFRESH_TOKEN_EXPIRE_DAYS: int = 7
+    ACCESS_TOKEN_EXPIRE_MINUTES: int = 0
+    REFRESH_TOKEN_EXPIRE_DAYS: int = 0
 
     POSTGRES_SERVER: str = "localhost"
     POSTGRES_USER: str = "postgres"

backend/app/core/security.py

@@ -50,9 +50,13 @@ def create_access_token(data: dict, expires_delta: Optional[timedelta] = None) -
     to_encode = data.copy()
     if expires_delta:
         expire = datetime.utcnow() + expires_delta
-    else:
+    elif settings.ACCESS_TOKEN_EXPIRE_MINUTES > 0:
         expire = datetime.utcnow() + timedelta(minutes=settings.ACCESS_TOKEN_EXPIRE_MINUTES)
-    to_encode.update({"exp": expire, "type": "access"})
+    else:
+        expire = None
+    if expire:
+        to_encode.update({"exp": expire})
+    to_encode.update({"type": "access"})
     if "sub" in to_encode:
         to_encode["sub"] = str(to_encode["sub"])
     return jwt.encode(to_encode, settings.SECRET_KEY, algorithm=settings.ALGORITHM)
@@ -60,8 +64,10 @@ def create_access_token(data: dict, expires_delta: Optional[timedelta] = None) -
 
 def create_refresh_token(data: dict) -> str:
     to_encode = data.copy()
-    expire = datetime.utcnow() + timedelta(days=settings.REFRESH_TOKEN_EXPIRE_DAYS)
-    to_encode.update({"exp": expire, "type": "refresh"})
+    if settings.REFRESH_TOKEN_EXPIRE_DAYS > 0:
+        expire = datetime.utcnow() + timedelta(days=settings.REFRESH_TOKEN_EXPIRE_DAYS)
+        to_encode.update({"exp": expire})
+    to_encode.update({"type": "refresh"})
     if "sub" in to_encode:
         to_encode["sub"] = str(to_encode["sub"])
     return jwt.encode(to_encode, settings.SECRET_KEY, algorithm=settings.ALGORITHM)