Add firmware SHA hash tool

shared/default-navigation.json

@@ -2,7 +2,7 @@
   "version": 1,
   "categories": [
     { "id": "encoding", "tools": ["ascii-hex", "base64"] },
-    { "id": "checksum", "tools": ["crc"] },
+    { "id": "checksum", "tools": ["crc", "firmware-hash"] },
     { "id": "crypto", "tools": ["aes-cmac", "rsa-key-pair", "random"] },
     { "id": "formatting", "tools": ["json", "xml"] },
     { "id": "image", "tools": ["png-ico"] }

shared/tool-catalog.json

@@ -50,6 +50,13 @@
       "description": "解析 BIN 或 Intel HEX 数据并计算 CRC。",
       "icon": "BadgeCheck"
     },
+    {
+      "id": "firmware-hash",
+      "title": "固件 Hash",
+      "category": "checksum",
+      "description": "解析 Intel HEX 有效数据并计算 SHA-256 / SHA-512。",
+      "icon": "Hash"
+    },
     {
       "id": "json",
       "title": "JSON",