feat(perf): enable GZipMiddleware reducing static transfer size by 81.7%

tests/test_api.py

@@ -788,5 +788,26 @@ def test_srs_queue_and_quiz_tag_filtering():
     assert not any(q["card"]["id"] == c2["id"] for q in quiz_items)
 
 
+def test_gzip_compression():
+    # 1. Assets >= 1000 bytes receive GZip encoding when requested
+    resp_js = client.get("/static/js/app.js", headers={"Accept-Encoding": "gzip"})
+    assert resp_js.status_code == 200
+    assert resp_js.headers.get("content-encoding") == "gzip"
 
+    resp_css = client.get("/static/css/style.css", headers={"Accept-Encoding": "gzip"})
+    assert resp_css.status_code == 200
+    assert resp_css.headers.get("content-encoding") == "gzip"
 
+    resp_html = client.get("/", headers={"Accept-Encoding": "gzip"})
+    assert resp_html.status_code == 200
+    assert resp_html.headers.get("content-encoding") == "gzip"
+
+    # 2. Assets < 1000 bytes are not compressed (respecting minimum_size=1000)
+    resp_manifest = client.get("/manifest.json", headers={"Accept-Encoding": "gzip"})
+    assert resp_manifest.status_code == 200
+    assert resp_manifest.headers.get("content-encoding") is None
+
+    # 3. Requests without gzip Accept-Encoding do not receive gzip
+    resp_raw = client.get("/static/js/app.js", headers={"Accept-Encoding": "identity"})
+    assert resp_raw.status_code == 200
+    assert resp_raw.headers.get("content-encoding") is None