feat(key-wallet): seed sync checkpoint from birth_height

[xdustinface]

WalletManager::import_wallet_from_extended_priv_key, import_wallet_from_xpub, and import_wallet_from_bytes (plus the matching FFI) gain a birth_height parameter so previously-used keys can rescan from a chosen height instead of being silently anchored at the chain tip.

Based on:

• fix: seed sync checkpoints from birth_height in ManagedWalletInfo ctors #692

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[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 70.60%. Comparing base (677a67c) to head (92aa0ba).
⚠️ Report is 1 commits behind head on v0.42-dev.

Files with missing lines	Patch %	Lines
key-wallet-manager/src/lib.rs	33.33%	4 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##           v0.42-dev     #693      +/-   ##
=============================================
+ Coverage      70.47%   70.60%   +0.13%     
=============================================
  Files            206      320     +114     
  Lines          43946    68028   +24082     
=============================================
+ Hits           30971    48032   +17061     
- Misses         12975    19996    +7021     

Flag	Coverage Δ
core	75.81% <ø> (ø)
ffi	43.33% <100.00%> (?)
rpc	20.00% <ø> (ø)
spv	87.42% <ø> (?)
wallet	69.54% <33.33%> (-0.01%)	⬇️

Files with missing lines	Coverage Δ
key-wallet-ffi/src/wallet_manager.rs	67.50% <100.00%> (ø)
key-wallet-manager/src/lib.rs	62.63% <33.33%> (-0.20%)	⬇️

... and 113 files with indirect coverage changes

[github-actions]

This PR has merge conflicts with the base branch. Please rebase or merge the base branch into your branch to resolve them.