Fix CI pipeline dependencies lock file error and missing test config

Co-authored-by: 0xrinegade <[email protected]>

Author: Copilot

.github/workflows/mcp-inspector.yml

@@ -31,7 +31,6 @@ jobs:
       uses: actions/setup-node@v4
       with:
         node-version: '18'
-        cache: 'npm'
 
     - name: Cache Rust dependencies
       uses: actions/cache@v4

test-config/mcp-config.json

@@ -0,0 +1,13 @@
+{
+  "mcpServers": {
+    "solana": {
+      "command": "./target/release/solana-mcp-server",
+      "args": ["stdio"],
+      "env": {
+        "SOLANA_RPC_URL": "https://api.devnet.solana.com",
+        "SOLANA_COMMITMENT": "confirmed",
+        "RUST_LOG": "debug"
+      }
+    }
+  }
+}