fix: use ASGITransport for httpx AsyncClient in tests

- httpx.AsyncClient requires ASGITransport for FastAPI app testing
- Updated all test files to use correct API

backend/tests/test_jobs.py

@@ -1,10 +1,10 @@
 import pytest
-from httpx import AsyncClient
+from httpx import AsyncClient, ASGITransport
 from app.main import app
 
 @pytest.mark.asyncio
 async def test_create_job():
-    async with AsyncClient(app=app, base_url="http://test") as ac:
+    async with AsyncClient(transport=ASGITransport(app=app), base_url="http://test") as ac:
         # Create a source first (job requires source_id)
         source_resp = await ac.post("/api/sources/", json={
             "name": "Test Source",
@@ -31,7 +31,7 @@ async def test_create_job():
 
 @pytest.mark.asyncio
 async def test_list_jobs():
-    async with AsyncClient(app=app, base_url="http://test") as ac:
+    async with AsyncClient(transport=ASGITransport(app=app), base_url="http://test") as ac:
         # Create source and job
         source_resp = await ac.post("/api/sources/", json={
             "name": "Test Source",
@@ -56,7 +56,7 @@ async def test_list_jobs():
 
 @pytest.mark.asyncio
 async def test_get_job():
-    async with AsyncClient(app=app, base_url="http://test") as ac:
+    async with AsyncClient(transport=ASGITransport(app=app), base_url="http://test") as ac:
         source_resp = await ac.post("/api/sources/", json={
             "name": "Test Source",
             "type": "local",
@@ -80,7 +80,7 @@ async def test_get_job():
 
 @pytest.mark.asyncio
 async def test_delete_job():
-    async with AsyncClient(app=app, base_url="http://test") as ac:
+    async with AsyncClient(transport=ASGITransport(app=app), base_url="http://test") as ac:
         source_resp = await ac.post("/api/sources/", json={
             "name": "Test Source",
             "type": "local",
@@ -102,13 +102,13 @@ async def test_delete_job():
     assert response.status_code == 200
     
     # Verify deletion
-    async with AsyncClient(app=app, base_url="http://test") as ac:
+    async with AsyncClient(transport=ASGITransport(app=app), base_url="http://test") as ac:
         get_resp = await ac.get(f"/api/jobs/{job_id}")
     assert get_resp.status_code == 404
 
 @pytest.mark.asyncio
 async def test_run_job():
-    async with AsyncClient(app=app, base_url="http://test") as ac:
+    async with AsyncClient(transport=ASGITransport(app=app), base_url="http://test") as ac:
         # Create source
         source_resp = await ac.post("/api/sources/", json={
             "name": "Test Source",
@@ -134,13 +134,13 @@ async def test_run_job():
 
 @pytest.mark.asyncio
 async def test_run_job_not_found():
-    async with AsyncClient(app=app, base_url="http://test") as ac:
+    async with AsyncClient(transport=ASGITransport(app=app), base_url="http://test") as ac:
         response = await ac.post("/api/jobs/999/run")
     assert response.status_code == 404
 
 @pytest.mark.asyncio
 async def test_update_job():
-    async with AsyncClient(app=app, base_url="http://test") as ac:
+    async with AsyncClient(transport=ASGITransport(app=app), base_url="http://test") as ac:
         # Create source
         source_resp = await ac.post("/api/sources/", json={
             "name": "Test Source",
@@ -169,7 +169,7 @@ async def test_update_job():
 
 @pytest.mark.asyncio
 async def test_create_schedule():
-    async with AsyncClient(app=app, base_url="http://test") as ac:
+    async with AsyncClient(transport=ASGITransport(app=app), base_url="http://test") as ac:
         # Create source
         source_resp = await ac.post("/api/sources/", json={
             "name": "Test Source",
@@ -202,18 +202,18 @@ async def test_create_schedule():
 
 @pytest.mark.asyncio
 async def test_get_job_not_found():
-    async with AsyncClient(app=app, base_url="http://test") as ac:
+    async with AsyncClient(transport=ASGITransport(app=app), base_url="http://test") as ac:
         response = await ac.get("/api/jobs/99999")
     assert response.status_code == 404
 
 @pytest.mark.asyncio
 async def test_update_job_not_found():
-    async with AsyncClient(app=app, base_url="http://test") as ac:
+    async with AsyncClient(transport=ASGITransport(app=app), base_url="http://test") as ac:
         response = await ac.put("/api/jobs/99999", json={"name": "Test"})
     assert response.status_code == 404
 
 @pytest.mark.asyncio
 async def test_delete_job_not_found():
-    async with AsyncClient(app=app, base_url="http://test") as ac:
+    async with AsyncClient(transport=ASGITransport(app=app), base_url="http://test") as ac:
         response = await ac.delete("/api/jobs/99999")
     assert response.status_code == 404