* fix(proxy): stream inference responses instead of buffering entire body
The inference.local proxy path called response.bytes().await which
buffered the entire upstream response before sending anything to the
client. For streaming SSE responses this inflated TTFB from sub-second
to the full generation time, causing clients with TTFB timeouts to abort.
Add a streaming proxy variant that returns response headers immediately
and forwards body chunks incrementally using HTTP chunked transfer
encoding. Non-streaming responses and mock routes continue to work
through the existing buffered path.
Closes#260
* docs: update architecture docs and example for inference streaming
* test(example): add direct NVIDIA endpoint tests via L7 TLS intercept
Expand inference example to 4 test cases: inference.local and direct
endpoint, each streaming and non-streaming. The direct path exercises
the L7 REST relay (relay_chunked) to verify it already streams
correctly. NVIDIA_API_KEY is picked up from the sandbox env when
started with --provider nvidia.
Mesut Oezdil