feat: add worker HTTP client

src/backend/services/worker_client.py

@@ -0,0 +1,47 @@
+import httpx
+
+from src.backend.config import settings
+
+
+class WorkerClient:
+    def __init__(self):
+        self.base_url = settings.worker_url
+
+    async def process(
+        self,
+        prompt: str,
+        system_prompt: str,
+        model: str,
+        session_id: str | None = None,
+    ) -> dict:
+        async with httpx.AsyncClient(timeout=300.0) as client:
+            resp = await client.post(
+                f"{self.base_url}/process",
+                json={
+                    "prompt": prompt,
+                    "system_prompt": system_prompt,
+                    "model": model,
+                    "session_id": session_id,
+                },
+            )
+            return resp.json()
+
+    async def summarize(
+        self,
+        exchanges: list[dict],
+        mode: str = "incremental",
+    ) -> dict:
+        async with httpx.AsyncClient(timeout=300.0) as client:
+            resp = await client.post(
+                f"{self.base_url}/summarize",
+                json={"exchanges": exchanges, "mode": mode},
+            )
+            return resp.json()
+
+    async def health(self) -> bool:
+        try:
+            async with httpx.AsyncClient(timeout=5.0) as client:
+                resp = await client.get(f"{self.base_url}/health")
+                return resp.status_code == 200
+        except Exception:
+            return False