refactor: rewrite Rust+C++ to Python with Qwen3-ASR-1.7B and Qwen3-8B-AWQ

- Remove all Rust source (14 .rs files), C++ backend, Cargo build system
- Add Python package (vra/) with 10 modules:
  - transcribe.py: Qwen3-ASR-1.7B via qwen-asr
  - summarize.py: Qwen3-8B-AWQ via vLLM (non-thinking mode)
  - pipeline.py: feed ingestion + processing orchestration
  - api.py: FastAPI HTTP server (same API surface)
  - storage.py: asyncpg PostgreSQL (same schema)
  - media.py: ffmpeg audio extraction
  - rss.py: RSS 2.0 XML rendering
  - config.py: environment-based configuration
  - __main__.py: CLI entry point (serve/verify)
- Target: Windows NVIDIA CUDA, optimized for runtime efficiency

Author: ArietidsZ

.gitignore

@@ -1,7 +1,5 @@
-/target/
 /.data/
 /tmp/
-/backends/build/
 *.log
 *.tmp
 *.raw
@@ -20,6 +18,10 @@
 *.ggml
 .DS_Store
 Thumbs.db
-node_modules/
-.venv/
 __pycache__/
+*.pyc
+.venv/
+*.egg-info/
+dist/
+build/
+.eggs/