feat(reality): derive a stable per-client spiderX for shared links

The inbound's spiderX now acts as a per-client seed: exports emit
sha256(seed|subKey) truncated to a 15-hex "/path", so a client's spx no
longer changes on every subscription fetch (#5718) while different
clients stop sharing one fingerprintable value. The form gains a
regenerate button that rotates every client's path at once.

The frontend link builders derive through the same function
(lib/xray/spider-x.ts, @noble/hashes) keyed on subId-then-email like
the Go subKey, so panel QR/copy links and subscription output agree —
cross-language vector tests lock both sides byte-for-byte. streamData
now tolerates malformed stored stream settings (unparseable JSON, null
tls/reality settings) instead of panicking the subscription request.

frontend/package.json

@@ -24,6 +24,7 @@
     "@ant-design/icons": "^6.3.2",
     "@codemirror/lang-json": "^6.0.2",
     "@codemirror/theme-one-dark": "^6.1.3",
+    "@noble/hashes": "^2.2.0",
     "@tanstack/react-query": "^5.101.2",
     "@tanstack/react-query-devtools": "^5.101.2",
     "antd": "^6.5.0",