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durch 7c3feaede3 Add LP registration idempotency and retry logic
Make LP registration resilient to network failures that could waste
credentials. When registration succeeds on the gateway but the response
is lost (e.g., network drop), clients can retry with the same WG key
and get the cached result instead of spending another credential.

Gateway-side:
- Add check_existing_registration() helper that looks up WG peer and
  returns cached GatewayData if already registered
- Add idempotency check in process_registration() dVPN branch
- Only return cached response if bandwidth > 0 (ensures registration
  was actually completed, not just peer created)
- Track idempotent registrations with lp_registration_dvpn_idempotent metric

Client-side:
- Add register_with_retry() to LpRegistrationClient that acquires
  credential once and retries handshake+registration on failure
- Add handshake_and_register_with_retry() to NestedLpSession for
  exit gateway registration via forwarding
- Add exponential backoff with jitter between retry attempts
- Verify outer session validity before nested session retry

Both retry methods clear state machine before retry to ensure fresh
handshake, and reuse the same credential across all attempts.
2026-01-08 15:45:14 +00:00

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