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/workflows/3-solutioning/check-implementation-readiness/templates/readiness-report-template.md

@@ -0,0 +1,4 @@
+# Implementation Readiness Assessment Report
+
+**Date:** {{date}}
+**Project:** {{project_name}}