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feat: Add Lightning wallet support via LNbits integration (#136) (#140)

* feat: Add Lightning wallet support via LNbits integration (#136)

Per-DID Lightning wallets through Drawbridge gateway:
- LNbits HTTP client for account/wallet/invoice/payment operations
- Drawbridge Lightning routes (wallet, balance, invoice, pay, check)
- DrawbridgeClient extending GatekeeperClient with Lightning methods
- DrawbridgeInterface extending GatekeeperInterface in gatekeeper types
- Keymaster Lightning methods with credential storage in wallet IDInfo
- Keymaster client, API routes, and CLI commands for all Lightning ops
- 23 unit tests covering wallet lifecycle, payments, and error cases

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* fix: CLI uses DrawbridgeClient, add LNbits URL to config

- CLI was using GatekeeperClient which lacks Lightning methods
- Add ARCHON_DRAWBRIDGE_LNBITS_URL to sample.env and docker-compose

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* fix: Handle LNbits balance field name variation

LNbits returns balance in msats under "balance" (older) or
"balance_msat" (newer). Try both fields.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* refactor: Rename gateway to drawbridge in Lightning methods, add 404 handling

Rename the local variable from `gateway` to `drawbridge` in all Keymaster
Lightning methods for clarity. Add 404 response handling in DrawbridgeClient
so pointing the CLI at a plain Gatekeeper gives a clean "Server does not
support Lightning" error instead of "Endpoint not found".

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

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Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

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