refactor(cch): refactor lnd trackers

[doitian]

Important

This is a stacked PR:

• refactor(cch): refactor lnd trackers #948 👈
  • feat: monitor fiber store changes for cch #950
    • Refactor CCH order with FSM and actions #971

• Define payment and invoice events to be sent to CCH for both fiber and
  lnd.
• These events can be emitted from fiber store changes in a later PR.
• Extract lnd trackers into its own module.
• Limit concurrent lnd invoice trackers to 5, scheduling them at
  5-minute intervals using a round-robin strategy.

Actions:

• Fix Failed to spawn test actor: ActorAlreadyRegistered("test_lnd_tracker")

[doitian]

This PR can simplify the task in #944 that uses store change event to monitor invoices and payments changes.

[Copilot]

Pull Request Overview

This PR refactors LND payment and invoice tracking by extracting the functionality into a dedicated actor module and introducing a unified event-based architecture for handling payment status changes.

Key Changes:

• Introduced CchIncomingEvent enum to represent payment and invoice status changes for both Fiber and LND
• Extracted LND tracking logic from CchActor into a dedicated LndTrackerActor with concurrency control (max 5 concurrent invoice trackers)
• Implemented timeout-based re-queuing for invoice trackers (5-minute timeout)

Reviewed Changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
crates/fiber-lib/src/cch/trackers/mod.rs	New module definition for LND trackers
crates/fiber-lib/src/cch/trackers/lnd_trackers.rs	Core implementation of LndTrackerActor with queue management and timeout logic
crates/fiber-lib/src/cch/tests/lnd_trackers_tests.rs	Unit tests for tracker queue and timeout behavior
crates/fiber-lib/src/cch/events.rs	Defines event types and status enums for payment/invoice tracking
crates/fiber-lib/src/cch/actor.rs	Refactored to use LndTrackerActor and event-based handling
crates/fiber-lib/src/cch/order.rs	Removed direct LND status conversions (moved to events module)
crates/fiber-lib/src/cch/error.rs	Updated error message for clarity
crates/fiber-lib/src/cch/mod.rs	Updated exports for new modules

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 301 lines in your changes missing coverage. Please review.
✅ Project coverage is 0.00%. Comparing base (0a887a6) to head (edbd824).

Files with missing lines	Patch %	Lines
crates/fiber-lib/src/cch/trackers/lnd_trackers.rs	0.00%	190 Missing ⚠️
crates/fiber-lib/src/cch/actor.rs	0.00%	83 Missing ⚠️
crates/fiber-lib/src/cch/events.rs	0.00%	28 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #948    +/-   ##
========================================
  Coverage     0.00%   0.00%            
========================================
  Files           61      63     +2     
  Lines        38210   38314   +104     
========================================
- Misses       38210   38314   +104     

Flag	Coverage Δ
unittests	0.00% <0.00%> (ø)

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