feat(session): query enabled sources before providers (#85)

UserSessionManager now queries the user_sources table for enabled
sources before calling any provider. Providers receive the per-user
JSON config directly instead of querying the DB themselves, removing
their db dependency and eliminating redundant round-trips.

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

apps/aelis-backend/src/location/provider.ts

@@ -1,26 +1,11 @@
 import { LocationSource } from "@aelis/source-location"
 
-import type { Database } from "../db/index.ts"
 import type { FeedSourceProvider } from "../session/feed-source-provider.ts"
 
-import { SourceDisabledError } from "../sources/errors.ts"
-import { sources } from "../sources/user-sources.ts"
-
 export class LocationSourceProvider implements FeedSourceProvider {
 	readonly sourceId = "aelis.location"
-	private readonly db: Database
-
-	constructor(db: Database) {
-		this.db = db
-	}
-
-	async feedSourceForUser(userId: string): Promise<LocationSource> {
-		const row = await sources(this.db, userId).find("aelis.location")
-
-		if (!row || !row.enabled) {
-			throw new SourceDisabledError("aelis.location", userId)
-		}
 
+	async feedSourceForUser(_userId: string, _config: unknown): Promise<LocationSource> {
 		return new LocationSource()
 	}
 }