Deconstruct VncThumbnailViewer 1.4.2 and add self-contained build

The shipped VncThumbnailViewerWin1.4.2.exe is a native launcher stub with a
Java JAR appended. This commit adds:

- src/: full Java source recovered from the bundled .class files (CFR),
  plus src/summary.txt with decompiler caveats
- ANALYSIS.md: architecture, data flow, hosts-file format, and security notes
- build-app-image.ps1: reproducible jpackage build that repackages the
  original classes and bundles a slim jlinked runtime (java.base + java.desktop)
  into a self-contained native app-image (no Java required on the target)

The 74 MB app-image is shipped as a release asset rather than tracked.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/HTTPConnectSocketFactory.java

@@ -0,0 +1,53 @@
+/*
+ * Decompiled with CFR 0.152.
+ */
+import java.applet.Applet;
+import java.io.IOException;
+import java.net.Socket;
+
+class HTTPConnectSocketFactory
+implements SocketFactory {
+    HTTPConnectSocketFactory() {
+    }
+
+    public Socket createSocket(String string, int n, Applet applet) throws IOException {
+        return this.createSocket(string, n, applet.getParameter("PROXYHOST1"), applet.getParameter("PROXYPORT1"));
+    }
+
+    public Socket createSocket(String string, int n, String[] stringArray) throws IOException {
+        return this.createSocket(string, n, this.readArg(stringArray, "PROXYHOST1"), this.readArg(stringArray, "PROXYPORT1"));
+    }
+
+    public Socket createSocket(String string, int n, String string2, String string3) throws IOException {
+        int n2 = 0;
+        if (string3 != null) {
+            try {
+                n2 = Integer.parseInt(string3);
+            }
+            catch (NumberFormatException numberFormatException) {
+                // empty catch block
+            }
+        }
+        if (string2 == null || n2 == 0) {
+            System.out.println("Incomplete parameter list for HTTPConnectSocket");
+            return new Socket(string, n);
+        }
+        System.out.println("HTTP CONNECT via proxy " + string2 + " port " + n2);
+        HTTPConnectSocket hTTPConnectSocket = new HTTPConnectSocket(string, n, string2, n2);
+        return hTTPConnectSocket;
+    }
+
+    private String readArg(String[] stringArray, String string) {
+        for (int i = 0; i < stringArray.length; i += 2) {
+            if (!stringArray[i].equalsIgnoreCase(string)) continue;
+            try {
+                return stringArray[i + 1];
+            }
+            catch (Exception exception) {
+                return null;
+            }
+        }
+        return null;
+    }
+}
+