feat: Python traffic generator with realistic varied HTTP/HTTPS traffic

- Replace curlimages/curl with Python stdlib traffic generator
- 200 requests, 10 workers, 16 scenario types:
  browsers (Chrome/Firefox/Safari/Edge/mobile), bots (Googlebot/Bing/curl/wget),
  GET/POST/HEAD/PUT/PATCH/DELETE/OPTIONS, HTTP + HTTPS
- Multiple SSL contexts (default, TLS1.2-only, TLS1.3-only, few_ciphers)
  → 4 distinct JA4/JA3 fingerprints per test run
- Realistic headers: Accept, Accept-Language, Sec-Fetch-*, Referer,
  X-Forwarded-For, Cookie, Cache-Control
- JSON payloads, form data, CORS preflights
- DB always reset (down -v) at start of each test run
- Enhanced Phase 5 checks: distinct UAs, method variety, JA4/JA3 counts + uniqueness

Results: 199/200 OK, 24 distinct UAs, 7 HTTP methods, TLS 1.2+1.3, 4 JA4 fingerprints

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

tests/integration/docker-compose.yml

@@ -142,14 +142,15 @@ services:
       - ja4net
 
   # ---------------------------------------------------------------------------
-  # Traffic generator — lightweight container with curl for sending external
-  # HTTPS requests to platform. Traffic must cross the Docker network so
-  # sentinel (pcap on eth0) can capture TLS ClientHello packets.
+  # Traffic generator — Python (stdlib only) sending varied HTTP/HTTPS requests
+  # to platform across the Docker network so sentinel (pcap on eth0) captures
+  # TLS ClientHello packets with real JA4/JA3 fingerprints.
+  # Multiple SSL contexts produce different TLS fingerprints per request.
   # ---------------------------------------------------------------------------
   traffic-gen:
-    image: curlimages/curl:latest
+    build:
+      context: traffic-gen
     hostname: traffic-gen
-    entrypoint: ["sleep", "infinity"]
     depends_on:
       platform:
         condition: service_healthy