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>

tests/test_mint_lightning_blink.py

@@ -98,11 +98,10 @@ async def test_blink_pay_invoice():
         unit="sat",
         amount=100,
         fee_reserve=12,
-        paid=False,
         state=MeltQuoteState.unpaid,
     )
     payment = await blink.pay_invoice(quote, 1000)
-    assert payment.ok
+    assert payment.settled
     assert payment.fee
     assert payment.fee.amount == 10
     assert payment.error_message is None
@@ -131,11 +130,10 @@ async def test_blink_pay_invoice_failure():
         unit="sat",
         amount=100,
         fee_reserve=12,
-        paid=False,
         state=MeltQuoteState.unpaid,
     )
     payment = await blink.pay_invoice(quote, 1000)
-    assert not payment.ok
+    assert not payment.settled
     assert payment.fee is None
     assert payment.error_message
     assert "This is the error" in payment.error_message
@@ -155,7 +153,7 @@ async def test_blink_get_invoice_status():
     }
     respx.post(blink.endpoint).mock(return_value=Response(200, json=mock_response))
     status = await blink.get_invoice_status("123")
-    assert status.paid
+    assert status.settled
 
 
 @respx.mock
@@ -183,7 +181,7 @@ async def test_blink_get_payment_status():
     }
     respx.post(blink.endpoint).mock(return_value=Response(200, json=mock_response))
     status = await blink.get_payment_status(payment_request)
-    assert status.paid
+    assert status.settled
     assert status.fee
     assert status.fee.amount == 10
     assert status.preimage == "123"