feat(FN-3109): add Docker connectivity service and target selector UI

This merge adds Docker connectivity management to Fusion (FN-3109), introducing a Docker client service in `@fusion/core` with typed interfaces for daemon connection configuration (host, socket path, TLS). The dashboard gains a `DockerTargetSelector` component for choosing between local socket and T

Fusion-Task-Id: FN-3109

packages/core/package.json

@@ -38,6 +38,7 @@
     "test": "vitest run --silent=passed-only --reporter=dot"
   },
   "devDependencies": {
+    "@types/dockerode": "^3.3.41",
     "@types/node": "^25.5.0",
     "@vitest/coverage-v8": "^3.1.0",
     "typescript": "^5.7.0",
@@ -51,6 +52,7 @@
     "bonjour-service": "^1.3.0",
     "check-disk-space": "^3.4.0",
     "cron-parser": "^5.5.0",
+    "dockerode": "^4.0.2",
     "extract-zip": "^2.0.1",
     "tar": "^7.5.13",
     "yaml": "^2.8.3"