refactor: consolidate backend services

Replace per-source services (LocationService, WeatherService,
TflService, FeedEngineService) with a single UserSessionManager
that owns all per-user state. Source creation is delegated to
thin FeedSourceProvider implementations per source type.

Co-authored-by: Ona <no-reply@ona.com>

apps/aris-backend/src/server.ts

@@ -1,25 +1,27 @@
+import { LocationSource } from "@aris/source-location"
 import { trpcServer } from "@hono/trpc-server"
 import { Hono } from "hono"
 
 import { registerAuthHandlers } from "./auth/http.ts"
-import { LocationService } from "./location/service.ts"
+import { UserSessionManager } from "./session/index.ts"
+import { WeatherSourceProvider } from "./weather/provider.ts"
 import { createContext } from "./trpc/context.ts"
 import { createTRPCRouter } from "./trpc/router.ts"
-import { WeatherService } from "./weather/service.ts"
 
 function main() {
-	const locationService = new LocationService()
+	const sessionManager = new UserSessionManager([
+		() => new LocationSource(),
+		new WeatherSourceProvider({
+			credentials: {
+				privateKey: process.env.WEATHERKIT_PRIVATE_KEY!,
+				keyId: process.env.WEATHERKIT_KEY_ID!,
+				teamId: process.env.WEATHERKIT_TEAM_ID!,
+				serviceId: process.env.WEATHERKIT_SERVICE_ID!,
+			},
+		}),
+	])
 
-	const weatherService = new WeatherService({
-		credentials: {
-			privateKey: process.env.WEATHERKIT_PRIVATE_KEY!,
-			keyId: process.env.WEATHERKIT_KEY_ID!,
-			teamId: process.env.WEATHERKIT_TEAM_ID!,
-			serviceId: process.env.WEATHERKIT_SERVICE_ID!,
-		},
-	})
-
-	const trpcRouter = createTRPCRouter({ locationService, weatherService })
+	const trpcRouter = createTRPCRouter({ sessionManager })
 
 	const app = new Hono()