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/bmm/teams/team-fullstack.yaml

@@ -0,0 +1,12 @@
+# <!-- Powered by BMAD-CORE™ -->
+bundle:
+  name: Team Plan and Architect
+  icon: 🚀
+  description: Team capable of project analysis, design, and architecture.
+agents:
+  - analyst
+  - architect
+  - pm
+  - sm
+  - ux-designer
+party: "./default-party.csv"