data(soc): add Global Smartphone Database chip stubs

Refs #1

Author: Seungpyo1007

data/soc/unisoc/2021/unisoc-sc7331e.json

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+{
+  "slug": "unisoc-sc7331e",
+  "name": "Unisoc SC7331E",
+  "manufacturer": "unisoc",
+  "release_date": "2021-04-04",
+  "process_nm": 28.0,
+  "gpu_name": "Mali-400 MP2",
+  "verified": false,
+  "source_urls": [
+    "https://www.kaggle.com/datasets/rajibdab/global-smartphone-database-2025"
+  ],
+  "raw_chipset": "Unisoc SC7331E"
+}

data/soc/unisoc/2023/unisoc-t616.json

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+{
+  "slug": "unisoc-t616",
+  "name": "Unisoc T616",
+  "manufacturer": "unisoc",
+  "release_date": "2023-09-11",
+  "process_nm": 12.0,
+  "gpu_name": "Mali-G57 MP1",
+  "verified": false,
+  "source_urls": [
+    "https://www.kaggle.com/datasets/rajibdab/global-smartphone-database-2025"
+  ],
+  "raw_chipset": "Unisoc T616"
+}

data/soc/unisoc/2024/unisoc-t615.json

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+{
+  "slug": "unisoc-t615",
+  "name": "Unisoc T615",
+  "manufacturer": "unisoc",
+  "release_date": "2024-08-08",
+  "process_nm": 12.0,
+  "gpu_name": "Mali-G57 MP1",
+  "verified": false,
+  "source_urls": [
+    "https://www.kaggle.com/datasets/rajibdab/global-smartphone-database-2025"
+  ],
+  "raw_chipset": "Unisoc T615"
+}

data/soc/unisoc/2025/unisoc-t7225.json

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+{
+  "slug": "unisoc-t7225",
+  "name": "Unisoc T7225",
+  "manufacturer": "unisoc",
+  "release_date": "2025-04-29",
+  "process_nm": 12.0,
+  "gpu_name": "Mali-G57",
+  "verified": false,
+  "source_urls": [
+    "https://www.kaggle.com/datasets/rajibdab/global-smartphone-database-2025"
+  ],
+  "raw_chipset": "Unisoc T7225"
+}