feat(dictionary): add iCloud KVS sync, cloud ASR, and lexicon expansion

Mirror the personal dictionary through iCloud Key-Value Store with
deterministic merge rules, main-app-only sync UI, and App Group as the
keyboard runtime cache. Add cloud-engine ASR with dictionary bias and
expand the bundled custom language model lexicon.

OSGKeyboardShared/Resources/CustomLanguageModel/v1/compiled-manifest.json

@@ -1,13 +1,13 @@
 {
-  "bin_bytes" : 174285,
+  "bin_bytes" : 198494,
   "bin_file" : "OSGKeyboardCLM.bin",
-  "export_seconds" : 0.029847979545593262,
-  "generated_at" : "2026-07-05T11:34:09Z",
+  "export_seconds" : 0.035165071487426758,
+  "generated_at" : "2026-07-06T13:16:27Z",
   "identifier" : "com.osgkeyboard.custom-lm.v1",
   "locale" : "zh_CN",
-  "phrase_count" : 11550,
+  "phrase_count" : 13329,
   "sources" : {
-    "ai_tech_seed" : 1259,
+    "ai_tech_seed" : 3040,
     "computer_terms" : 10300
   },
   "version" : "1.0.0"