test(ai): Add comprehensive E2E tests for all AI providers

- Add multi-turn test to verify thinking and tool calling work together
- Test thinkingSignature handling for proper multi-turn context
- Fix Gemini provider to generate base64 thinkingSignature when needed
- Handle multiple rounds of tool calls in tests (Gemini behavior)
- Make thinking tests more robust for model-dependent behavior
- All 18 tests passing across 4 providers

package-lock.json

@@ -634,9 +634,9 @@
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@@ -654,15 +654,6 @@
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@@ -1051,9 +1042,9 @@
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@@ -1611,13 +1602,11 @@
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