feat: add VNC support with noVNC integration

- Introduced a new VNC viewer panel in the frontend, allowing users to connect to VNC sessions.
- Implemented VNC connection handling with optional SSH tunneling in the backend.
- Added a new SSH key manager for managing SSH keys within the terminal.
- Created a trigger rules engine to monitor terminal output and trigger actions based on defined patterns.
- Added CSS styles for the VNC viewer and its components.
- Updated database schema to support VNC protocol in profiles.
- Implemented WebSocket proxy for VNC connections to facilitate communication between the frontend and backend.

frontend/scripts/bundle-novnc.js

@@ -0,0 +1,34 @@
+/**
+ * bundle-novnc.js — Uses esbuild to bundle noVNC's RFB class into a single
+ * script that exposes window.noVNC.RFB for use in the frontend.
+ *
+ * noVNC 1.5+ uses top-level await which is incompatible with IIFE format,
+ * so we bundle as ESM then wrap in an async IIFE via banner/footer.
+ */
+"use strict";
+
+const esbuild = require("esbuild");
+const path = require("path");
+
+const entryPoint = path.resolve(__dirname, "novnc-entry.js");
+const outFile = path.resolve(__dirname, "..", "src", "js", "lib", "novnc.min.js");
+
+esbuild
+  .build({
+    entryPoints: [entryPoint],
+    bundle: true,
+    minify: true,
+    format: "esm",
+    outfile: outFile,
+    target: ["safari15"],
+    logLevel: "info",
+    banner: { js: ";(async function() {" },
+    footer: { js: "})();" },
+  })
+  .then(() => {
+    console.log("[bundle-novnc] noVNC bundled successfully → src/js/lib/novnc.min.js");
+  })
+  .catch((err) => {
+    console.error("[bundle-novnc] Failed:", err.message);
+    process.exit(1);
+  });

frontend/scripts/novnc-entry.js

@@ -0,0 +1,4 @@
+// Entry point for esbuild bundling of noVNC.
+// Assigns RFB to window.noVNC so it's available as a global in the frontend.
+import RFB from "@novnc/novnc";
+window.noVNC = { RFB: RFB };