chore(align): sync Git with running container as authoritative source

One-time alignment to close drift between the running container
(qihu-aiflow / image qihuaiflow:with-deps) and this Git repository.
Container hotfixes previously persisted only via `docker commit` are now
captured in Git so Git becomes the single source of truth.

Backend:
- chat_service.py: accumulated fixes incl. EigenFlux README guidance
- chat_context.py / chat_media.py: URL/web-repo context injection
- api/url_reader.py: NEW SSRF-safe web/README reader (Issue #725)
- skills_admin.py & Skills.tsx: 14-scene capability unification
- pgvector_search.py, orchestrator.py, platform_knowledge.py,
  market.py, admin/models.py: drift sync

Frontend:
- ChatPage.tsx: collapsible AI think/act block (Issue #724)
- MarketPage / EvolutionDashboard / TokenDashboard styling sync

Migrations:
- 018_normalize_marketapp_scene.sql: fixed capability allowlist
  (prevents capability wipe on restart)

Alignment performed 2026-07-23 05:42:47. No deletions; secrets/venv/node_modules/
caches were not touched (tracked-source-only copy).

backend/python/app/api/admin/models.py

@@ -932,7 +932,13 @@ async def test_model_connection(
                     "n": 1,
                     "size": "1024x1024",
                 }
-                resp = await client.post(image_url, json=payload, headers=headers)
+                # 与运行时媒体生成一致：用 _proxy_for_url 解析代理并 trust_env=False；
+                # 图像端点会被 _proxy_for_url 判定为直连(公网 API 直连比代理更稳定)
+                from ..chat_utils import _proxy_for_url
+                async with httpx.AsyncClient(
+                    timeout=timeout, proxy=_proxy_for_url(image_url), trust_env=False
+                ) as img_client:
+                    resp = await img_client.post(image_url, json=payload, headers=headers)
                 latency = int((time.time() - start) * 1000)
 
                 if resp.status_code == 200: