fix(security): harden CSRF with Content-Type gate and OpenAPI sync (#2819)

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 5 no-body POST handlers (snapshot/save,
manager/queue/{reset,start,update_comfyui}, manager/reboot) to block
<form method=POST> CSRF that bypasses method-only gating. Convert 10 pure
state-changing endpoints (fetch_updates, queue/{update_all,reset,start,
update_comfyui}, snapshot/{remove,restore,save}, comfyui_switch_version,
reboot) from GET to POST and split 5 config endpoints
(db_mode/preview_method/channel_url_list/policy/{component,update}) into
GET(read) + POST(write, JSON body). Emit the in_progress + done event pair
from the /manager/queue/install sync-enable fast-path so client UI
finalizes (previously only queue/start's empty worker done fired, leaving
item.restart unset and the Enable button visible after a successful enable).
Harden js/custom-nodes-manager.js completion path: await onQueueCompleted
with try/catch (surfaces silent turbogrid stale-item throws), replace the
{}.length == 0 no-op empty guard, set install_context before queue/install
to avoid a sync-completion race, wrap classList/updateCell in try/catch.
Resynchronize openapi.yaml with the converted routes (method → post, query
params → requestBody JSON schema, sibling post on 5 split endpoints).
Update 31 JS fetchApi call sites across 7 files; add
tests/test_csrf_content_type_helper.py covering 5 Content-Type cases via
aiohttp TestClient.

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)

js/model-manager.js

@@ -170,7 +170,7 @@ export class ModelManager {
 
 			".cmm-manager-stop": {
 				click: () => {
-					api.fetchApi('/manager/queue/reset');
+					api.fetchApi('/manager/queue/reset', { method: 'POST' });
 					infoToast('Cancel', 'Remaining tasks will stop after completing the current task.');
 				}
 			},
@@ -444,7 +444,7 @@ export class ModelManager {
 		let needRefresh = false;
 		let errorMsg = "";
 
-		await api.fetchApi('/manager/queue/reset');
+		await api.fetchApi('/manager/queue/reset', { method: 'POST' });
 
 		let target_items = [];
 
@@ -503,7 +503,7 @@ export class ModelManager {
 			}
 		}
 		else {
-			await api.fetchApi('/manager/queue/start');
+			await api.fetchApi('/manager/queue/start', { method: 'POST' });
 			this.showStop();
 			showTerminal();
 		}