Enable M5 auto-scan alerts and remove live dashboard

M5 already broadcast through the shared _scan_timeframe path but was
documented as data-only (docstring, CLAUDE.md, DOCUMENTATION.md, plus a
phantom `if tf == M5: return` step that never existed in code). Align all
docs/comments so M5 alerting at C+ grade is the intended, documented behavior.

Remove the live dashboard entirely per request: the 30s refresh loop,
per-scan refresh, boot send, and the dashboard-only stats layer
(_signal_stats / _stats_updated / _update_signal_stats and its call sites,
_format_stats_dashboard and its helper constants). Drop now-unused ZoneInfo
import and dashboard mentions from help/autoscan/boot messages and the test
suite. The WebSocket level-breach monitor and level cache are untouched.

Tests: 136 passed, 0 failed.

CLAUDE.md

@@ -18,8 +18,7 @@ Twelve Data REST API + WebSocket
 telegram_bot.py  main.py
 (Telegram alerts, (CLI single-pair
  auto-scanner,    analysis)
- WS monitor,
- live dashboard)
+ WS monitor)
 ```
 
 ## Core Files
@@ -31,7 +30,7 @@ telegram_bot.py  main.py
 | `engine.py` | `TechnicalEngine` — computes EMA, RSI, BB, ADX, ATR, MACD, ROC, Keltner, divergences, candlestick patterns, swing S/R |
 | `signal_aggregator.py` | `SignalAggregator` — MTF analysis, news integration, diminishing penalty cap, trade setup generation |
 | `news_engine.py` | Economic calendar (Forex Factory JSON) + RSS sentiment (keyword-based) |
-| `telegram_bot.py` | Async Telegram bot with auto-scanner (M5/M15/H1/H4), WebSocket price monitor, live dashboard |
+| `telegram_bot.py` | Async Telegram bot with auto-scanner (M5/M15/H1/H4), WebSocket price monitor |
 | `main.py` | CLI entry point for XAU/USD analysis |
 | `test_all.py` | Comprehensive QA suite (~137 tests, no live API needed) |
 
@@ -91,10 +90,9 @@ python backtest/gpu_backtest.py --pair XAUUSD --days 365
 
 ## Telegram Bot
 
-- **Auto-scan:** M5 (data-only, no alerts), M15, H1, H4 at candle boundaries + 10s buffer
+- **Auto-scan:** M5, M15, H1, H4 at candle boundaries + 10s buffer (all timeframes alert)
 - **Manual scan:** Buttons for M15/H1/H4 individual scans + "Scan All TFs" multi-timeframe summary
 - **WebSocket:** Streams live ticks for XAU/USD; triggers immediate M15 scan on key level breach (swing S/R, BB, KC, EMA200) with 5-min cooldown
-- **Live dashboard:** Edit-in-place message, 30s refresh, shows XAU/USD across timeframes
 - **Commands:** `/start`, `/scan`, `/autoscan`, `/status`, `/cache`, `/clearcache`, `/help`
 
 ## Backtesting