feat: parallel async processing and compact output mode

Major performance improvements:
- Parallel search execution across all queries
- Parallel article fetching with 10 concurrent limit
- Parallel embeddings with rate limiting (4 concurrent)
- Polly integration for retry resilience

New features:
- Add -v/--verbose flag for detailed output
- Compact single-line status mode with braille spinner
- StatusReporter service for unified output handling
- Query generation and errors hidden in compact mode
- ANSI escape codes for clean line updates

New files:
- Services/RateLimiter.cs - Semaphore-based concurrency control
- Services/StatusReporter.cs - Verbose/compact output handler
- Models/ParallelOptions.cs - Parallel processing configuration

All changes maintain Native AOT compatibility.

Models/OpenQueryOptions.cs

@@ -6,5 +6,6 @@ public record OpenQueryOptions(
     int Queries,
     bool Short,
     bool Long,
+    bool Verbose,
     string Question
-);
+);