feat(data): 新增亚太枢纽 新加坡 节点配置文件与本土化搜索词库

data/keywords/kw_SG.txt

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+singapore weather forecast
+mrt map singapore
+straitstimes breaking news
+cpf board login
+hdb bto launch updates
+best chicken rice near me
+public holidays sg
+singpass login portal
+changi airport flight status
+iras tax filing

data/regions/SG/Default/Singapore.json

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+{
+  "region_name": "Singapore - Singapore",
+  "google_module": {
+    "base_lat": 1.3521,
+    "base_lon": 103.8198,
+    "lang_params": "hl=en-SG&gl=SG",
+    "valid_url_suffix": "com.sg"
+  },
+  "trust_module": {
+    "white_urls": [
+      "https://www.straitstimes.com/",
+      "https://www.channelnewsasia.com/",
+      "https://www.gov.sg/",
+      "https://shopee.sg/",
+      "https://en.wikipedia.org/wiki/Special:Random",
+      "https://www.fairprice.com.sg/",
+      "https://www.dbs.com.sg/"
+    ]
+  }
+}