feat(api): add static address operation metrics

[behroozrafii]

Add outcome-based metrics for static address assignment, removal, and
preallocation operations.

The new events use the repository's carbide_instrument::Event framework
and record one counter event for each completed operation:

• carbide_static_address_assignments_total
• carbide_static_address_removals_total
• carbide_static_address_preallocations_total

Each counter includes a bounded outcome label. Error outcomes also emit
a warning containing the error context, while successful outcomes only
update the corresponding metric.

The existing database and API behavior is unchanged. The public handlers
call the original operation logic, record its outcome, and return the
original result.

Related issues

Closes #837

Type of Change

• Add - New feature or capability
• Change - Changes in existing functionality
• Fix - Bug fixes
• Remove - Removed features or deprecated functionality
• Internal - Internal changes (refactoring, tests, docs, etc.)

Breaking Changes

• This PR contains breaking changes

Testing

• Unit tests added/updated
• Integration tests added/updated
• Manual testing performed
• No testing required (docs, internal refactor, etc.)

Validated on Linux:

• cargo check -p carbide-api-core
• cargo test -p carbide-api-core --lib static_address_metrics::tests::events_count_all_outcomes_and_log_only_errors

The focused unit test verifies that every assignment, removal, and
preallocation outcome increments the expected counter and that only error
outcomes produce warning logs.

Additional Notes

The implementation follows the current repository instrumentation
guidelines by using bounded outcome labels and _total counter names.

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