feat(data): add Bulgaria Sofia region support

- Add Bulgaria entry to the Europe region map
- Add Sofia region configuration for Google and trust modules
- Add Bulgarian local keyword list

data/map.json

@@ -394,6 +394,23 @@
             }
           ]
         },
+        {
+          "id": "BG",
+          "name": "Bulgaria (保加利亚)",
+          "keyword_file": "kw_BG.txt",
+          "states": [
+            {
+              "id": "Default",
+              "name": "Default State",
+              "cities": [
+                {
+                  "id": "Sofia",
+                  "name": "Sofia (索非亚)"
+                }
+              ]
+            }
+          ]
+        },
         {
           "id": "DE",
           "name": "Germany (德国)",
@@ -817,4 +834,4 @@
       ]
     }
   ]
-}
+}