feat: enhance desktop packaging process with self-contained harness verification

- Updated README and README.zh to clarify packaging commands and added verification step.
- Improved packaging scripts to automatically build the self-contained runtime and verify its integrity.
- Introduced new scripts for verifying harness self-containment and booting the web profile.
- Added comprehensive tests for relinking harness symlinks and ensuring self-containment.
- Updated package.json scripts to reflect new build and verification processes.

apps/desktop/scripts/harness-relink.d.mts

@@ -0,0 +1,14 @@
+/** Type declarations for the pure relink/verify helpers in harness-relink.mjs. */
+export interface RelinkReport {
+  normalized: number
+  dereferenced: number
+  unchanged: number
+  removed: number
+  errors: string[]
+}
+
+export function isWithin(root: string, p: string): boolean
+export function relinkHarness(out: string, repoRoot: string): RelinkReport
+export function findEscapingLinks(out: string): string[]
+export function assertSelfContained(out: string): void
+export function probeSymlinkSupport(): boolean