fix: add prettier Solidity plugin and configuration

Added @prettier/plugin-solidity package and .prettierrc configuration to enable
Solidity file parsing in prettier linting. This fixes the 'No parser could be inferred'
error for .sol files.

packages/solidity/aitbc-token/.prettierrc

@@ -0,0 +1,17 @@
+{
+  "plugins": ["@prettier/plugin-solidity"],
+  "overrides": [
+    {
+      "files": "*.sol",
+      "options": {
+        "parser": "solidity-parse",
+        "printWidth": 80,
+        "tabWidth": 2,
+        "useTabs": false,
+        "singleQuote": false,
+        "bracketSpacing": true,
+        "explicitTypes": "always"
+      }
+    }
+  ]
+}

packages/solidity/aitbc-token/package.json

@@ -27,6 +27,7 @@
     "ethers": "^6.16.0",
     "hardhat": "^3.3.0",
     "hardhat-gas-reporter": "^1.0.10",
+    "@prettier/plugin-solidity": "^1.3.1",
     "prettier": "^3.2.5",
     "solidity-coverage": "^0.8.4",
     "ts-node": "^10.9.2",