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/regions/BG/Default/Sofia.json

@@ -0,0 +1,29 @@
+{
+  "region_name": "Bulgaria - Sofia",
+  "google_module": {
+    "base_lat": 42.6977,
+    "base_lon": 23.3219,
+    "lang_params": "hl=bg&gl=BG",
+    "valid_url_suffix": "bg"
+  },
+  "trust_module": {
+    "white_urls": [
+      "https://www.apple.com/",
+      "https://www.microsoft.com/",
+      "https://en.wikipedia.org/wiki/Special:Random",
+      "https://en.wikipedia.org/wiki/Special:Random?r=42816",
+      "https://news.google.com/topstories?hl=bg&gl=BG&ceid=BG:bg",
+      "https://news.google.com/search?q=%D0%91%D1%8A%D0%BB%D0%B3%D0%B0%D1%80%D0%B8%D1%8F&hl=bg&gl=BG&ceid=BG:bg",
+      "https://news.google.com/search?q=%D0%A1%D0%BE%D1%84%D0%B8%D1%8F&hl=bg&gl=BG&ceid=BG:bg"
+    ],
+    "static_urls": [
+      "https://www.gov.bg/",
+      "https://www.nra.bg/",
+      "https://www.bnb.bg/",
+      "https://www.bdz.bg/",
+      "https://www.uni-sofia.bg/",
+      "https://www.vivacom.bg/",
+      "https://www.btvnovinite.bg/"
+    ]
+  }
+}