chore(release): open v3.8.12 development cycle

Bump 3.8.11 → 3.8.12 across package.json, lockfile, electron/, open-sse/, and
docs/reference/openapi.yaml; add the [3.8.12] cycle placeholder to the root
CHANGELOG and the 41 i18n mirrors. Integration branch for the v3.8.12 cycle —
fixes/features land here via per-issue PRs and it merges to main at release time.

electron/package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "omniroute-desktop",
-  "version": "3.8.9",
+  "version": "3.8.12",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "omniroute-desktop",
-      "version": "3.8.9",
+      "version": "3.8.12",
       "license": "MIT",
       "dependencies": {
         "electron-updater": "^6.8.8"

electron/package.json

@@ -1,6 +1,6 @@
 {
   "name": "omniroute-desktop",
-  "version": "3.8.10",
+  "version": "3.8.12",
   "description": "OmniRoute Desktop Application",
   "main": "main.js",
   "author": {