fix(security): harden CSRF with Content-Type gate and expand E2E coverage (#2818)

Defense-in-depth over GET→POST alone: reject the three CORS-safelisted
simple-form Content-Types (x-www-form-urlencoded, multipart/form-data,
text/plain) on 16 no-body POST handlers (glob + legacy) to block
<form method=POST> CSRF that bypasses method-only gating. Move
comfyui_switch_version to a JSON body so the preflight requirement applies.
Split db_mode/policy/update/channel_url_list into GET(read) + POST(write).
Tighten do_fix (high → high+) and gate three previously-ungated config
setters at middle. Resynchronize openapi.yaml (27 paths, 30 operations,
ComfyUISwitchVersionParams as a shared $ref component). Add E2E harness
variants, Playwright config, CSRF/secgate suites, 39-endpoint coverage,
and a CHANGELOG.

Breaking: legacy per-op POST routes (install/uninstall/fix/disable/update/
reinstall/abort_current) are removed; callers already use queue/batch.
Legacy /manager/notice (v1) is removed; /v2/manager/notice is retained.

Reported-by: XlabAI Team of Tencent Xuanwu Lab
CVSS: 8.1 (AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H)

.github/workflows/e2e.yml

@@ -71,4 +71,4 @@ jobs:
           fi
           uv pip install --python "$VENV_PY" pytest pytest-timeout
 
-          "$VENV_PY" -m pytest tests/e2e/test_e2e_uv_compile.py -v -s --timeout=300
+          "$VENV_PY" -m pytest tests/cli/test_uv_compile.py -v -s --timeout=300