feat(server): migrate copilot to native (#14620)

#### PR Dependency Tree


* **PR #14620** 👈

This tree was auto-generated by
[Charcoal](https://github.com/danerwilliams/charcoal)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **New Features**
* Native LLM workflows: structured outputs, embeddings, and reranking
plus richer multimodal attachments (images, audio, files) and improved
remote-attachment inlining.

* **Refactor**
* Tooling API unified behind a local tool-definition helper;
provider/adapters reorganized to route through native dispatch paths.

* **Chores**
* Dependency updates, removed legacy Google SDK integrations, and
increased front memory allocation.

* **Tests**
* Expanded end-to-end and streaming tests exercising native provider
flows, attachments, and rerank/structured scenarios.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

tests/affine-cloud-copilot/e2e/settings/embedding.spec.ts

@@ -189,20 +189,13 @@ test.describe('AISettings/Embedding', () => {
 
     await utils.settings.closeSettingsPanel(page);
 
-    await utils.chatPanel.makeChat(
-      page,
-      `What is Workspace${randomStr1}? What is Workspace${randomStr2}?`
-    );
+    const query = `Use semantic search across workspace and attached files, then tell me whether Workspace${randomStr1} is a cat or dog and whether Workspace${randomStr2} is a cat or dog. Answer with citations.`;
+
+    await utils.chatPanel.makeChat(page, query);
 
     await utils.chatPanel.waitForHistory(page, [
-      {
-        role: 'user',
-        content: `What is Workspace${randomStr1}? What is Workspace${randomStr2}?`,
-      },
-      {
-        role: 'assistant',
-        status: 'success',
-      },
+      { role: 'user', content: query },
+      { role: 'assistant', status: 'success' },
     ]);
 
     await expect(async () => {