feat(core): add anthropic provider (#11911)

Close [AI-40](https://linear.app/affine-design/issue/AI-40).

### What changed?
- Add anthropic provider.

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

- **New Features**
  - Added support for Anthropic as a new provider option in Copilot, enabling integration with Anthropic's text generation models.
  - Users can now configure Anthropic provider settings, including API key management, through the admin interface.

- **Chores**
  - Updated dependencies to include the Anthropic SDK for backend operations.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

yarn.lock

@@ -889,6 +889,7 @@ __metadata:
     "@affine-tools/utils": "workspace:*"
     "@affine/graphql": "workspace:*"
     "@affine/server-native": "workspace:*"
+    "@ai-sdk/anthropic": "npm:^1.2.10"
     "@ai-sdk/google": "npm:^1.2.10"
     "@ai-sdk/openai": "npm:^1.3.18"
     "@ai-sdk/perplexity": "npm:^1.1.6"
@@ -1052,6 +1053,18 @@ __metadata:
   languageName: unknown
   linkType: soft
 
+"@ai-sdk/anthropic@npm:^1.2.10":
+  version: 1.2.10
+  resolution: "@ai-sdk/anthropic@npm:1.2.10"
+  dependencies:
+    "@ai-sdk/provider": "npm:1.1.3"
+    "@ai-sdk/provider-utils": "npm:2.2.7"
+  peerDependencies:
+    zod: ^3.0.0
+  checksum: 10/4701f83886592e635fab36d8026e7b764f444f40a2c636340fcf267d8d1c846c7ee710b548a782cec6ecafac1d967be74d4e87d6f6f780b0725a1a580cab77d3
+  languageName: node
+  linkType: hard
+
 "@ai-sdk/google@npm:^1.2.10":
   version: 1.2.11
   resolution: "@ai-sdk/google@npm:1.2.11"