Separate server-side and client-side PocketBase URLs

Server-side code (health checks, API routes) needs to use internal
sidecar URL (POCKETBASE_URL at runtime), while client-side needs
public URL (NEXT_PUBLIC_POCKETBASE_URL baked at build time).

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/lib/pocketbase.ts

@@ -5,8 +5,12 @@ import PocketBase, { type RecordModel } from "pocketbase";
 
 import type { OverrideType, User } from "@/types";
 
+// Client-side uses NEXT_PUBLIC_POCKETBASE_URL (baked at build time)
+// Server-side uses POCKETBASE_URL (runtime) for internal communication, falls back to NEXT_PUBLIC_
 const POCKETBASE_URL =
-  process.env.NEXT_PUBLIC_POCKETBASE_URL || "http://localhost:8090";
+  process.env.POCKETBASE_URL ||
+  process.env.NEXT_PUBLIC_POCKETBASE_URL ||
+  "http://localhost:8090";
 
 /**
  * Singleton PocketBase client for client-side usage.