WIP: New melt flow (#622)

* `PaymentResult`

* ledger: rely on PaymentResult instead of paid flag. Double check for payments marked pending.

* `None` is `PENDING`

* make format

* reflected changes API tests where `PaymentStatus` is used + reflected changes in lnbits

* reflect changes in blink backend and tests

* fix lnbits get_payment_status

* remove paid flag

* fix mypy

* remove more paid flags

* fix strike mypy

* green

* shorten all state checks

* fix

* fix some tests

* gimme ✅

* fix............

* fix lnbits

* fix error

* lightning refactor

* add more regtest tests

* add tests for pending state and failure

* shorten checks

* use match case for startup check - and remember modified checking_id from pay_invoice

* fix strike pending return

* new tests?

* refactor startup routine into get_melt_quote

* test with purge

* refactor blink

* cleanup responses

* blink: return checking_id on failure

* fix lndgrpc try except

* add more testing for melt branches

* speed things up a bit

* remove comments

* remove comments

* block pending melt quotes

* remove comments

---------

Co-authored-by: lollerfirst <lollerfirst@gmail.com>

cashu/mint/router.py

@@ -168,7 +168,7 @@ async def mint_quote(
     resp = PostMintQuoteResponse(
         request=quote.request,
         quote=quote.quote,
-        paid=quote.paid,
+        paid=quote.paid,  # deprecated
         state=quote.state.value,
         expiry=quote.expiry,
     )
@@ -192,7 +192,7 @@ async def get_mint_quote(request: Request, quote: str) -> PostMintQuoteResponse:
     resp = PostMintQuoteResponse(
         quote=mint_quote.quote,
         request=mint_quote.request,
-        paid=mint_quote.paid,
+        paid=mint_quote.paid,  # deprecated
         state=mint_quote.state.value,
         expiry=mint_quote.expiry,
     )