feat: stream chat responses token-by-token via SSE#47
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Adds POST /chat/stream using PydanticAI's agent.run_stream() and FastAPI's StreamingResponse. The frontend switches to consuming the SSE stream with ReadableStream, appending delta chunks as they arrive and showing a blinking cursor while the response is in flight. The original POST /chat endpoint is kept for backwards compatibility. Co-Authored-By: Claude Sonnet 4.6 <[email protected]> Claude-Session: https://claude.ai/code/session_01TrFG7pvoxnBsTfctHzaKPK
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Adds POST /chat/stream using PydanticAI's agent.run_stream() and
FastAPI's StreamingResponse. The frontend switches to consuming the
SSE stream with ReadableStream, appending delta chunks as they arrive
and showing a blinking cursor while the response is in flight.