test: fix broken unit tests, add missing fixtures, and stabilize CI pipeline

- Fix os module mock pattern for Vitest v4 in proxy-ide-config tests

- Fix enterprise oauth_client_key expectations in cloudHandler-sync and token-manager-parity tests

- Fix proxy-controller integration test argument expectations

- Add missing proxy-parity JSON fixtures (OpenAI tools, Anthropic tool-use, Gemini SSE)

- Add reasoning_content mapping to convertClaudeToOpenAIResponse

- Fix google-api service test env var cache leak with resetModules + dynamic imports

- Fix proxy-metrics timer tests by calling onModuleInit in beforeEach

- Fix locale-sensitive number formatting in StatCard tests

- Add missing test files to version control (components, hooks, ipc, mocks, server, utils)

- Fix CI workflows: testing.yaml (use vitest run, add type-check job, npm cache), lint.yaml and format.yaml (add npm cache, concurrency, fix job names)

src/tests/fixtures/proxy-parity/response/anthropic.tool-use.expected.json

@@ -0,0 +1,22 @@
+{
+  "model": "claude-3-sonnet",
+  "message": {
+    "content": null,
+    "tool_calls": [
+      {
+        "id": "tool_1",
+        "type": "function",
+        "function": {
+          "name": "get_weather",
+          "arguments": "{\"location\":\"NYC\"}"
+        }
+      }
+    ]
+  },
+  "finish_reason": "tool_calls",
+  "usage": {
+    "prompt_tokens": 10,
+    "completion_tokens": 20,
+    "total_tokens": 30
+  }
+}