feat(core): add google vertex ai (#12423)

Close [AI-125](https://linear.app/affine-design/issue/AI-125)

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

- **New Features**
  - Added new provider configurations `geminiVertex` and `anthropicVertex` for Google Vertex AI in backend schema, provider classes, and admin config.
  - Introduced `GeminiVertexProvider` and `AnthropicVertexProvider` classes supporting Vertex AI models with specific capabilities.
  - Expanded model options for transcription prompts with newer Gemini models.
  - Re-exported provider modules to include Vertex AI variants.

- **Improvements**
  - Extended provider architecture to support separate Vertex AI configurations and models.
  - Updated test setup to replace deprecated provider references with new Vertex variants.
  - Consolidated environment variables for server testing with a single `SERVER_CONFIG`.

- **Bug Fixes**
  - Updated mock models and import references in tests to align with new provider classes.

- **Chores**
  - Added `@ai-sdk/google-vertex` dependency for Vertex AI support.
  - Updated dependency list to include `@ai-sdk/google-vertex`.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/backend/server/src/plugins/copilot/config.ts

@@ -3,12 +3,15 @@ import {
   StorageJSONSchema,
   StorageProviderConfig,
 } from '../../base';
-import { AnthropicConfig } from './providers/anthropic';
+import {
+  AnthropicOfficialConfig,
+  AnthropicVertexConfig,
+} from './providers/anthropic';
 import type { FalConfig } from './providers/fal';
-import { GeminiConfig } from './providers/gemini';
+import { GeminiGenerativeConfig, GeminiVertexConfig } from './providers/gemini';
 import { OpenAIConfig } from './providers/openai';
 import { PerplexityConfig } from './providers/perplexity';
-
+import { VertexSchema } from './providers/types';
 declare global {
   interface AppConfigSchema {
     copilot: {
@@ -23,9 +26,11 @@ declare global {
       providers: {
         openai: ConfigItem<OpenAIConfig>;
         fal: ConfigItem<FalConfig>;
-        gemini: ConfigItem<GeminiConfig>;
+        gemini: ConfigItem<GeminiGenerativeConfig>;
+        geminiVertex: ConfigItem<GeminiVertexConfig>;
         perplexity: ConfigItem<PerplexityConfig>;
-        anthropic: ConfigItem<AnthropicConfig>;
+        anthropic: ConfigItem<AnthropicOfficialConfig>;
+        anthropicVertex: ConfigItem<AnthropicVertexConfig>;
       };
     };
   }
@@ -55,6 +60,11 @@ defineModuleConfig('copilot', {
       apiKey: '',
     },
   },
+  'providers.geminiVertex': {
+    desc: 'The config for the gemini provider in Google Vertex AI.',
+    default: {},
+    schema: VertexSchema,
+  },
   'providers.perplexity': {
     desc: 'The config for the perplexity provider.',
     default: {
@@ -67,6 +77,11 @@ defineModuleConfig('copilot', {
       apiKey: '',
     },
   },
+  'providers.anthropicVertex': {
+    desc: 'The config for the anthropic provider in Google Vertex AI.',
+    default: {},
+    schema: VertexSchema,
+  },
   unsplash: {
     desc: 'The config for the unsplash key.',
     default: {