refactor(pr-report): simplify PRReviewReporter instantiation

[diogot]

File: Sources/Xproject/Services/PRReportService.swift
Lines: 758-778

PRReviewReporter is instantiated twice in both branches of the conditional. This can be simplified:

// Current (duplicated):
if config.inlineAnnotations {
    let reviewReporter = PRReviewReporter(...)
    if !annotations.isEmpty {
        _ = try await reviewReporter.report(annotations)
    } else {
        try await reviewReporter.cleanup()
    }
} else {
    let reviewReporter = PRReviewReporter(...)
    try await reviewReporter.cleanup()
}

// Suggested (simplified):
let reviewReporter = PRReviewReporter(
    context: context,
    identifier: identifier,
    outOfRangeStrategy: .fallbackToComment
)
if config.inlineAnnotations && !annotations.isEmpty {
    _ = try await reviewReporter.report(annotations)
} else {
    try await reviewReporter.cleanup()
}

Originally identified in PR #29.