feat: update routes with color and direction, improve admin routes view, and update firebase config/auth

backend/app/models/route.py

@@ -24,6 +24,8 @@ class Route(SQLModel, table=True):
     description: Optional[str] = None
     origin_city: str
     destination_city: str
+    color: str = Field(default="#FEE715")
+    direction: str = Field(default="outbound")
     distance_km: Optional[float] = None
     estimated_duration_minutes: Optional[int] = None
     average_speed_kmh: Optional[float] = None