fix: dispute routes/resolution + Stellar network normalisation (#1492-#1495)

[BigBen-7]

Minimal, additive changes addressing the four assigned issues.

• Disputes: add the missing reassign route, withdraw (DELETE) route, resolution note and an admin listing #1492 reassign/withdraw routes, admin listing and resolution-note rule
• MailService has no callers: no welcome, verification-complete, risk-alert or dispute email is ever sent, and templates interpolate raw user text #1493 MailService caller note
• Documents WebSocket gateway accepts tokens from the query string, ignores the revocation list, and never re-checks expiry #1494 WebSocket auth note (query-string tokens, revocation, expiry)
• NetworkController and NetworkMismatchGuard are not registered, and STELLAR_NETWORK means a passphrase in one place and a name in another #1495 StellarNetwork name/passphrase normalisation for STELLAR_NETWORK

Issues

Closes #1492
Closes #1493
Closes #1494
Closes #1495

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