refactor(docs): consolidate and cleanup documentation

- Delete 9 deprecated/obsolete docs (~6,300 lines removed)
- Move test PDFs to tests/fixtures/ocr-samples/
- Create docs/DEPLOYMENT.md as principal guide
- Create tests/ocr-validation/README.md
- Update all refs for ultrathin monolith architecture
- Update OCR tests to use relative paths

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

docs/telegram/README.md

@@ -1,11 +1,7 @@
 # ROA2WEB Telegram Bot
 
-> ⚠️ **ARCHITECTURE NOTE**
->
-> This documentation partially references the old standalone bot architecture.
-> The current architecture is an **ultrathin monolith** where the Telegram bot runs
-> as a background task within the main backend (`backend/main.py`) on port 8000/8001.
-> The `INTERNAL_API_PORT` variable is no longer used - internal API is at `/api/telegram/internal/*`.
+> **Architecture:** Ultrathin Monolith - Telegram bot runs as a background task within the unified backend on port 8000.
+> See `docs/telegram/DEPLOYMENT.md` for single-worker requirement.
 
 > **Telegram Frontend for ROA2WEB ERP System** with Direct Command Interface
 
@@ -71,78 +67,45 @@ The bot uses a standalone SQLite database for:
 - **telegram_auth_codes**: Temporary 8-character linking codes (15 min expiry)
 - **telegram_sessions**: Active company selection and session state
 
-## Installation & Setup
+## Setup & Configuration
 
 ### Prerequisites
 
-- Python 3.11+
-- Telegram account
-- ROA2WEB backend API running (default: http://localhost:8001)
+- ROA2WEB backend running (the bot runs as part of the unified backend)
+- Telegram Bot Token (from @BotFather)
 
-### Step 1: Create Telegram Bot
+### Step 1: Create Telegram Bot (One-time)
 
 1. Open Telegram and search for `@BotFather`
 2. Send `/newbot` command
 3. Follow prompts to create bot
 4. Save the bot token provided
 
-### Step 2: Install Dependencies
+### Step 2: Configure Environment
+
+Add to `backend/.env`:
 
 ```bash
-# Navigate to telegram-bot directory
-cd backend/modules/telegram
-
-# Create virtual environment
-python3 -m venv venv
-
-# Activate virtual environment
-source venv/bin/activate  # Linux/Mac
-# or
-venv\Scripts\activate     # Windows
-
-# Install dependencies
-pip install -r requirements.txt
-```
-
-### Step 3: Configure Environment
-
-```bash
-# Copy environment template
-cp .env.example .env
-
-# Edit .env file with your configuration
-nano .env
-```
-
-Required configuration in `.env`:
-
-```bash
-# Required
+# Telegram Bot Configuration
+MODULE_TELEGRAM_ENABLED=true
 TELEGRAM_BOT_TOKEN=your_bot_token_from_botfather
-BACKEND_URL=http://localhost:8001
-
-# Database
-SQLITE_DB_PATH=./data/telegram_bot.db
-
-# Internal API - DEPRECATED (now served via main backend at /api/telegram/internal/*)
-# INTERNAL_API_PORT=8002
-
-# Optional
-LOG_LEVEL=INFO
-SENTRY_DSN=https://your-sentry-dsn
-ENVIRONMENT=production
 ```
 
-### Step 4: Run the Bot
+### Step 3: Start the Application
 
 ```bash
-# Make sure backend is running first
-# Backend should be at http://localhost:8001 (or configured BACKEND_URL)
+# From project root - starts backend with Telegram bot integrated
+./start-prod.sh
 
-# Run the bot
-python -m app.main
+# Or for testing:
+./start-test.sh
 ```
 
+The bot starts automatically as a background task when `MODULE_TELEGRAM_ENABLED=true`.
+
+> **Important:** Backend must run with `--workers 1` for Telegram bot to work correctly.
+> See `docs/telegram/DEPLOYMENT.md` for details.
+
 ## Usage
 
 ### Available Commands