Refactor: API cleanup

[rolznz]

Fixes getAlby/hub#101
Fixes getAlby/hub#102
Fixes getAlby/hub#111

• Move LSP code out of API to new LSP service
• Move backup to new Backup service
• Fix wails router not supporting new channel endpoint
• Fix LSPS1 not calculating refund address
• Move config into separate package
• Move lnclient files into packages under lnclient, each in their own package
• Move http files into own package
• Make info endpoint dumber, remove unused code
• Move old models files

To move to a new issue:

Go:

• move nip47 notifier into nip47 package
• move nip47 handler methods into nip47 package
• move wails code into wails package
• move service code into own package
• move tests out of main package
• move main files into separate commands rather than using build tags
• Review how LSP and backup services are accessed by API
• Improve DB queries - join apps and permissions together
• Remove duplication publishing error responses in handlers
• Reduce duplication in multi_payment vs single payment methods
• Simplify Wails request router
• Replace session auth with JWT auth, remove CSRF