mcp: move config to .mcp.json.example, gitignore real config

The real .mcp.json now contains Loki credentials for basic auth,
so it should not be committed. The example file has placeholders.

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

.mcp.json.example

@@ -0,0 +1,48 @@
+{
+  "mcpServers": {
+    "nixpkgs-options": {
+      "command": "nix",
+      "args": ["run", "git+https://git.t-juice.club/torjus/labmcp#nixpkgs-search", "--", "options", "serve"],
+      "env": {
+        "NIXPKGS_SEARCH_DATABASE": "sqlite:///run/user/1000/labmcp/nixpkgs-search.db"
+      }
+    },
+    "nixpkgs-packages": {
+      "command": "nix",
+      "args": ["run", "git+https://git.t-juice.club/torjus/labmcp#nixpkgs-search", "--", "packages", "serve"],
+      "env": {
+        "NIXPKGS_SEARCH_DATABASE": "sqlite:///run/user/1000/labmcp/nixpkgs-search.db"
+      }
+    },
+    "lab-monitoring": {
+      "command": "nix",
+      "args": ["run", "git+https://git.t-juice.club/torjus/labmcp#lab-monitoring", "--", "serve", "--enable-silences"],
+      "env": {
+        "PROMETHEUS_URL": "https://prometheus.home.2rjus.net",
+        "ALERTMANAGER_URL": "https://alertmanager.home.2rjus.net",
+        "LOKI_URL": "https://loki.home.2rjus.net",
+        "LOKI_USERNAME": "promtail",
+        "LOKI_PASSWORD": "<password from: bao kv get -field=password secret/shared/loki/push-auth>"
+      }
+    },
+    "homelab-deploy": {
+      "command": "nix",
+      "args": [
+        "run",
+        "git+https://git.t-juice.club/torjus/homelab-deploy",
+        "--",
+        "mcp",
+        "--nats-url", "nats://nats1.home.2rjus.net:4222",
+        "--nkey-file", "/home/torjus/.config/homelab-deploy/test-deployer.nkey",
+        "--enable-builds"
+      ]
+    },
+    "git-explorer": {
+      "command": "nix",
+      "args": ["run", "git+https://git.t-juice.club/torjus/labmcp#git-explorer", "--", "serve"],
+      "env": {
+        "GIT_REPO_PATH": "/home/torjus/git/nixos-servers"
+      }
+    }
+  }
+}