feat(prompt-compression): add headroom raw proxy deployment for Render

prompt_compression/headroom-proxy/Dockerfile

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+FROM python:3.12-slim
+
+RUN apt-get update \
+    && apt-get install -y --no-install-recommends build-essential \
+    && pip install --no-cache-dir "headroom-ai[proxy]==0.27.0" \
+    && apt-get purge -y build-essential \
+    && apt-get autoremove -y \
+    && rm -rf /var/lib/apt/lists/*
+
+EXPOSE 8787
+
+ENV HEADROOM_TELEMETRY=off
+
+CMD ["headroom", "proxy", "--host", "0.0.0.0", "--port", "8787"]

prompt_compression/headroom-proxy/render.yaml

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+services:
+  - type: web
+    name: headroom-proxy
+    runtime: docker
+    plan: starter
+    dockerfilePath: ./Dockerfile
+    dockerContext: .
+    envVars:
+      - key: OPENAI_API_KEY
+        sync: false
+      - key: ANTHROPIC_API_KEY
+        sync: false
+      - key: HEADROOM_TELEMETRY
+        value: "off"
+    healthCheckPath: /health