fix: Use chromadb v3.2.2 with v2 API heartbeat endpoint

- Updated chromadb from ^1.9.2 to ^3.2.2 (includes CLI binary)
- Changed heartbeat endpoint from /api/v1 to /api/v2

The 1.9.x version did not include the CLI, causing `npx chroma run` to fail.
Version 3.2.2 includes the chroma CLI and uses the v2 API.

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

src/services/sync/ChromaServerManager.ts

@@ -131,7 +131,7 @@ export class ChromaServerManager {
     while (Date.now() - startTime < timeoutMs) {
       try {
         const response = await fetch(
-          `http://${this.config.host}:${this.config.port}/api/v1/heartbeat`
+          `http://${this.config.host}:${this.config.port}/api/v2/heartbeat`
         );
         if (response.ok) {
           this.ready = true;