style: apply Prettier formatting to TS/JS/JSON/MD files

Add Prettier as a dev dependency with .prettierrc.json config and
.prettierignore. Hook added via mirrors-prettier in pre-commit config.
All TypeScript, JSON, Markdown, and YAML files auto-formatted.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

config/linux-config.example.json

@@ -1,15 +1,15 @@
-{
-  "mcpServers": {
-    "kicad": {
-      "command": "node",
-      "args": ["/home/YOUR_USERNAME/MCP/KiCAD-MCP-Server/dist/index.js"],
-      "env": {
-        "NODE_ENV": "production",
-        "PYTHONPATH": "/usr/share/kicad/scripting/plugins:/usr/lib/kicad/lib/python3/dist-packages",
-        "LOG_LEVEL": "info",
-        "KICAD_AUTO_LAUNCH": "false"
-      },
-      "description": "KiCAD PCB Design Assistant - Note: PYTHONPATH auto-detected if venv exists"
-    }
-  }
-}
+{
+  "mcpServers": {
+    "kicad": {
+      "command": "node",
+      "args": ["/home/YOUR_USERNAME/MCP/KiCAD-MCP-Server/dist/index.js"],
+      "env": {
+        "NODE_ENV": "production",
+        "PYTHONPATH": "/usr/share/kicad/scripting/plugins:/usr/lib/kicad/lib/python3/dist-packages",
+        "LOG_LEVEL": "info",
+        "KICAD_AUTO_LAUNCH": "false"
+      },
+      "description": "KiCAD PCB Design Assistant - Note: PYTHONPATH auto-detected if venv exists"
+    }
+  }
+}