docs: address PR review feedback

- architecture.mdx: fix backends/ file list (remove nonexistent qwen_backend.py, rename tada_backend.py → hume_backend.py)
- model-management.mdx: Kokoro language count 9 → 8 (matches ModelConfig)
- model-management.mdx: ProgressManager path services/ → utils/
- tts-generation.mdx: ModelConfig example uses field(default_factory=...) — mutable default would raise at runtime
- tts-generation.mdx: "1080p samples" → "on CUDA" (1080p is video, not audio)
- PROJECT_STATUS.md: replace ASCII architecture diagram with prose (matches no-ASCII-art rule)

Co-Authored-By: Claude Opus 4.7 (1M context) <[email protected]>

docs/PROJECT_STATUS.md

@@ -19,36 +19,20 @@
 
 ## Architecture Overview
 
-```
-┌─────────────────────────────────────────────────────┐
-│  Tauri Shell (Rust)                                 │
-│  ┌───────────────────────────────────────────────┐  │
-│  │  React Frontend (app/)                        │  │
-│  │  Zustand stores · API client · Generation UI  │  │
-│  │  Stories Editor · Voice Profiles · Model Mgmt │  │
-│  └──────────────────────┬────────────────────────┘  │
-│                         │ HTTP :17493                │
-│  ┌──────────────────────▼────────────────────────┐  │
-│  │  FastAPI Backend (backend/)                   │  │
-│  │  ┌─────────────────────────────────────────┐  │  │
-│  │  │ TTSBackend Protocol                     │  │  │
-│  │  │  ┌──────────┐ ┌───────┐ ┌───────────┐  │  │  │
-│  │  │  │ Qwen3-TTS│ │LuxTTS │ │Chatterbox │  │  │  │
-│  │  │  │(Py/MLX)  │ │       │ │(MTL+Turbo)│  │  │  │
-│  │  │  └──────────┘ └───────┘ └───────────┘  │  │  │
-│  │  │  ┌──────────┐ ┌────────┐ ┌──────────┐ │  │  │
-│  │  │  │ TADA     │ │Kokoro  │ │Qwen      │ │  │  │
-│  │  │  │(1B / 3B) │ │(82M)   │ │CustomVoice│ │  │  │
-│  │  │  └──────────┘ └────────┘ └──────────┘ │  │  │
-│  │  └─────────────────────────────────────────┘  │  │
-│  │  ┌───────────┐  ┌─────────┐                   │  │
-│  │  │ STTBackend│  │ Profiles│                   │  │
-│  │  │ (Whisper) │  │ History │                   │  │
-│  │  └───────────┘  │ Stories │                   │  │
-│  │                  └─────────┘                   │  │
-│  └───────────────────────────────────────────────┘  │
-└─────────────────────────────────────────────────────┘
-```
+**Tauri shell (Rust)** hosts a **React frontend** (`app/`) that talks over HTTP on `localhost:17493` to a **FastAPI backend** (`backend/`).
+
+The backend exposes:
+
+- **`TTSBackend` Protocol** with seven concrete engine implementations:
+  - Qwen3-TTS (PyTorch or MLX depending on platform)
+  - Qwen CustomVoice (predefined speakers with instruct)
+  - LuxTTS (fast, CPU-friendly)
+  - Chatterbox Multilingual (23 languages)
+  - Chatterbox Turbo (English, paralinguistic tags)
+  - TADA (1B English, 3B multilingual via HumeAI)
+  - Kokoro 82M (pre-built voices, CPU realtime)
+- **`STTBackend` Protocol** for Whisper (PyTorch or MLX-Whisper)
+- **Profiles / History / Stories** services for persistence and timeline editing
 
 ### Key Files