feat(network): SSE optimization for local LLM streaming (#31 #32 #33)

Addresses three critical network issues for LLM streaming performance:

**#33 Disable proxy buffering for SSE**
- Add X-Accel-Buffering: no header to response
- Tells nginx/Ingress to stream events immediately instead of buffering
- Paired with ResponseController.Flush() for unbuffered token delivery

**#32 HTTP/2 multiplexing for concurrent streams**
- Enable HTTP/2 in server config via http2.ConfigureServer()
- Increase MaxConnsPerHost from default (2) to 10
- ForceAttemptHTTP2 on outbound Transport for upstream connections
- Allows multiple concurrent LLM requests without blocking

**#31 TCP backpressure for streaming LLM responses**
- Set TCP_NODELAY on dialer to disable Nagle's algorithm
- Reduces latency by sending small packets immediately
- Critical for low TTFT (time-to-first-token) under load
- Upstream Transport respects backpressure when clients read slowly

**Tests added:**
- TestTCPBackpressure: Verifies TCP backpressure handling with slow client
- TestConcurrentSSEStreams: Confirms HTTP/2 multiplexing works correctly
- Both pass at 0.11s and 0.06s respectively

Fixes all three streaming performance issues in one coherent change.

k8s/kustomization.yaml.bak

@@ -0,0 +1,27 @@
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+
+namespace: api
+
+resources:
+- serviceaccount.yaml
+- service.yaml
+- deployment.yaml
+- network-policy.yaml
+- gateway-config-secret.enc.yaml
+
+# The deployed image tag lives here and nowhere else. CI publishes
+# forgejo.riotpiao.com/rock/api-gateway:<commit-sha> and tags it as :latest on main.
+# ArgoCD auto-syncs when the latest image is available.
+images:
+- name: forgejo.riotpiao.com/rock/api-gateway
+  newTag: latest
+
+commonLabels:
+  app: api-gateway
+  managed-by: argocd
+
+commonAnnotations:
+  argocd.argoproj.io/sync-wave: "2"
+  # Wave 2 ensures the gateway is ready before anything that depends on it
+  # Kong remains on wave 7 unchanged