feat(frontend): migrate render jobs off Supabase to V2 render orchestrator; drop all Supabase lib files

- render-jobs.ts: replace Supabase client with V2 gateway calls
  POST /v1/renders (saved_project_id + quality + resolution + frame_rate)
  GET  /v1/renders/:id/progress for status polling
  GET  /v1/renders/:id + /v1/exports/:id/download-url for completed output URL
  triggerRenderWorker is now a no-op (V2 dispatches internally)
- render/route.ts: add getAccessToken() guard, pass token to createRenderJob
- render/[jobId]/status/route.ts: add getAccessToken() guard, pass token to getRenderJob
- Delete src/lib/supabase/, src/lib/supabase.ts — no remaining consumers

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/app/api/render/[jobId]/status/route.ts

@@ -1,5 +1,6 @@
 import { NextResponse } from "next/server";
 
+import { getAccessToken } from "@/lib/auth/session";
 import { getRenderJob } from "@/lib/render-jobs";
 
 export const runtime = "nodejs";
@@ -15,7 +16,12 @@ export async function GET(_request: Request, context: RouteContext) {
     return NextResponse.json({ error: "jobId required" }, { status: 400 });
   }
 
-  const job = await getRenderJob(jobId);
+  const token = await getAccessToken();
+  if (!token) {
+    return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
+  }
+
+  const job = await getRenderJob(jobId, token);
   if (!job) {
     return NextResponse.json({ error: "Job not found" }, { status: 404 });
   }

src/app/api/render/route.ts

@@ -1,11 +1,17 @@
 import { NextResponse } from "next/server";
 
+import { getAccessToken } from "@/lib/auth/session";
+import { createRenderJob } from "@/lib/render-jobs";
 import { renderRequestSchema } from "@/lib/render-schemas";
-import { createRenderJob, triggerRenderWorker } from "@/lib/render-jobs";
 
 export const runtime = "nodejs";
 
 export async function POST(request: Request) {
+  const token = await getAccessToken();
+  if (!token) {
+    return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
+  }
+
   let body: unknown;
   try {
     body = await request.json();
@@ -21,12 +27,10 @@ export async function POST(request: Request) {
     );
   }
 
-  const result = await createRenderJob(parsed.data);
+  const result = await createRenderJob(parsed.data, token);
   if ("error" in result) {
     return NextResponse.json({ error: result.error }, { status: 500 });
   }
 
-  await triggerRenderWorker(result.jobId);
-
   return NextResponse.json({ jobId: result.jobId });
 }