Use patched LNbits image and bypass self-onion zaps

[macterra]

What changed

• switch the lightning compose stack to the published patched LNbits image ghcr.io/archetech/lnbits:1.5.3-archetech.1
• bypass Tor self-loopback for local DID-to-DID zaps when the published Lightning endpoint resolves back to this same stack
• record the repo workflow note to prefer gh for GitHub write operations

Why

• we wanted to use the Archetech-patched LNbits image instead of the local build
• local zaps on localhost were failing because lightning-mediator tried to reach this stack's own onion callback through the Tor SOCKS proxy and timed out
• local recipients can be served directly over the internal Docker network without changing remote onion behavior

Impact

• the lightning stack now pulls the patched LNbits image directly
• localhost-to-localhost zaps succeed again for recipients published on the same stack
• remote onion recipients still use the Tor proxy path

Validation

• pulled and restarted lnbits on ghcr.io/archetech/lnbits:1.5.3-archetech.1
• reproduced the original timeout from inside lightning-mediator
• rebuilt and restarted lightning-mediator
• verified a local zap succeeds after the self-onion bypass change
• verified lightning-mediator health is green after restart