fix: ChatBubble crash and DeepSeek API compatibility

- Fix ChatBubble to handle non-string content with String() wrapper
- Fix API route to use generateText for non-streaming requests
- Add @ai-sdk/openai-compatible for non-OpenAI providers (DeepSeek, etc.)
- Use Chat Completions API instead of Responses API for compatible providers
- Update ChatBubble tests and fix component exports to kebab-case
- Remove stale PascalCase ChatBubble.tsx file

_bmad/_config/manifest.yaml

@@ -0,0 +1,11 @@
+installation:
+  version: 6.0.0-alpha.23
+  installDate: 2026-01-19T04:24:02.786Z
+  lastUpdated: 2026-01-19T04:24:02.786Z
+modules:
+  - core
+  - bmb
+  - bmm
+ides:
+  - claude-code
+  - antigravity