Bitcoind process management DRAFT_PR

[R27-pixel]

Summary

This PR adds initial process management support for Bitcoin Core (bitcoind) in PDM.

Changes

• Added controls to start ,stop and restart the bitcoind process.
• Added process state tracking and UI updates.
• Improved error handling for process startup and shutdown.

[codecov]

Codecov Report

❌ Patch coverage is 72.29903% with 541 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/components/bitcoin_status_view.rs	57.85%	169 Missing ⚠️
src/app.rs	48.90%	163 Missing ⚠️
src/main.rs	49.66%	76 Missing ⚠️
src/process_manager.rs	70.16%	71 Missing ⚠️
src/bitcoin_logs.rs	83.81%	39 Missing ⚠️
src/components/bitcoin_client.rs	96.03%	20 Missing ⚠️
src/components/status_bar.rs	91.89%	3 Missing ⚠️

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[R27-pixel]

Closing this PR as Bitcoin Core process management is no longer part of PDM's intended scope. PDM will only expose the Bitcoin information required by the P2Poolv2 interface through RPC, while Bitcoin Core remains independently managed.