do not always return UnknownQuoteTTL
return UnknownMintInfo when appropriate
add a new UnknownConfigKey for unknown key values
unit tests to cover this functionality
Bug: https://github.com/cashubtc/cdk/actions/runs/15683152414/job/44190084378?pr=822#step:5:19212
Reason: a race condition between removing proofs while melting and the quote states being updated.
Solution:
1. Error on duplicate proofs
2. Read quote when updating to avoid race conditions and rollbacks
Real solution: A transaction trait in the storage layer. That is coming next
* Migrate from `sqlx` to rusqlite
1. Add rusqlite with rusqlite with a working thread
2. Add wallet without a thread (synchronous)
3. Add custom migration
Co-authored-by: thesimplekid <tsk@thesimplekid.com>
