feat: 新增 Gemini CLI provider adapter

- 新增 gemini_cli adapter 包（client/constants/envelope/plugin/quota）
- 实现 v1internal 协议封装、OAuth enrichment、loadCodeAssist/onboardUser 流程
- 实现配额耗尽检测与冷却元数据管理（RESOURCE_EXHAUSTED 解析）
- 新增 GeminiCliQuotaReader 支持按模型粒度的配额展示
- endpoint check 支持流式回退和 v1internal 响应解包
- health_policy 429 处理增加 Google 配额冷却解析
- error_handler 在限流时同步 Gemini CLI 配额状态
- 前端添加 Gemini CLI provider 类型选项和 OAuth 图标
- 新增 preset models（gemini-2.5-pro/flash, gemini-3-pro/flash, gemini-3.1-pro）
- 新增 gemini_cli quota 单元测试

Closes #216

Co-authored-by: Entropy.Xu <entropy.xu@cloudhabitatsh.com>

tests/services/test_gemini_cli_quota.py

@@ -0,0 +1,117 @@
+from __future__ import annotations
+
+from types import SimpleNamespace
+from typing import Any, cast
+
+from src.services.orchestration.error_handler import ErrorHandlerService
+from src.services.provider.adapters.gemini_cli.quota import (
+    build_quota_exhausted_metadata,
+    extract_quota_cooldown_seconds,
+)
+
+
+class _FakeDB:
+    def __init__(self) -> None:
+        self.added: list[object] = []
+        self.commit_count = 0
+
+    def add(self, obj: object) -> None:
+        self.added.append(obj)
+
+    def commit(self) -> None:
+        self.commit_count += 1
+
+
+def test_extract_quota_cooldown_seconds_from_message_reset_after() -> None:
+    error_text = """
+    {
+      "error": {
+        "code": 429,
+        "message": "You have exhausted your capacity on this model. Your quota will reset after 27s.",
+        "status": "RESOURCE_EXHAUSTED",
+        "details": [
+          {
+            "@type": "type.googleapis.com/google.rpc.ErrorInfo",
+            "reason": "RATE_LIMIT_EXCEEDED",
+            "domain": "cloudcode-pa.googleapis.com",
+            "metadata": {
+              "model": "gemini-3-pro-preview"
+            }
+          }
+        ]
+      }
+    }
+    """
+
+    assert extract_quota_cooldown_seconds(error_text, now_ts=1_700_000_000) == 27
+
+
+def test_build_quota_exhausted_metadata_skips_unknown_reset_window() -> None:
+    error_text = """
+    {
+      "error": {
+        "code": 429,
+        "message": "No capacity available for model gemini-3.1-pro-preview on the server",
+        "status": "RESOURCE_EXHAUSTED",
+        "details": [
+          {
+            "@type": "type.googleapis.com/google.rpc.ErrorInfo",
+            "reason": "MODEL_CAPACITY_EXHAUSTED",
+            "domain": "cloudcode-pa.googleapis.com",
+            "metadata": {
+              "model": "gemini-3.1-pro-preview"
+            }
+          }
+        ]
+      }
+    }
+    """
+
+    assert (
+        build_quota_exhausted_metadata(
+            model_name="gemini-3.1-pro-preview",
+            error_text=error_text,
+            current_namespace=None,
+            now_ts=1_700_000_000,
+        )
+        is None
+    )
+
+
+def test_sync_gemini_cli_quota_state_uses_error_model_not_global_model_id() -> None:
+    db = _FakeDB()
+    service = ErrorHandlerService(db=cast(Any, db))
+    key = SimpleNamespace(id="k1", upstream_metadata={})
+    provider = SimpleNamespace(provider_type="gemini_cli")
+    error_text = """
+    {
+      "error": {
+        "code": 429,
+        "message": "You have exhausted your capacity on this model. Your quota will reset after 27s.",
+        "status": "RESOURCE_EXHAUSTED",
+        "details": [
+          {
+            "@type": "type.googleapis.com/google.rpc.ErrorInfo",
+            "reason": "RATE_LIMIT_EXCEEDED",
+            "domain": "cloudcode-pa.googleapis.com",
+            "metadata": {
+              "model": "gemini-3-pro-preview"
+            }
+          }
+        ]
+      }
+    }
+    """
+
+    service._sync_gemini_cli_quota_state(
+        key=cast(Any, key),
+        provider=cast(Any, provider),
+        model_name="17855939-7164-44b3-9354-f87851b25ec6",
+        error_text=error_text,
+        request_id="req-1",
+    )
+
+    quota_by_model = key.upstream_metadata["gemini_cli"]["quota_by_model"]
+    assert "gemini-3-pro-preview" in quota_by_model
+    assert "17855939-7164-44b3-9354-f87851b25ec6" not in quota_by_model
+    assert db.commit_count == 1