feat: replace ML optimizer with on-chain accumulation zone monitor

Complete rewrite — replaces the ML-based signal optimizer with a transparent
on-chain metric monitoring dashboard. Scrapes 10 metrics from LookIntoBitcoin
(Playwright) and free APIs, scores each 0-10, composite 0-100.

Metrics: Fear & Greed, Puell Multiple, MVRV Z-Score, Drawdown from ATH,
Price vs 200W SMA, Reserve Risk, RHODL Ratio, NUPL, LTH Realized Price,
Hash Ribbons. Auto-refreshes every 15 minutes. Settings page preserved.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

scrapers/fear_greed.py

@@ -0,0 +1,34 @@
+"""Fear & Greed Index from alternative.me API."""
+
+import logging
+import requests
+
+log = logging.getLogger(__name__)
+
+FNG_URL = "https://api.alternative.me/fng/?limit=30"
+
+
+def fetch():
+    """Fetch Fear & Greed data. Returns dict with value, classification, and recent history."""
+    try:
+        resp = requests.get(FNG_URL, timeout=15)
+        resp.raise_for_status()
+        data = resp.json()
+        entries = data.get("data", [])
+        if not entries:
+            return {"value": None, "error": "No data"}
+
+        current = entries[0]
+        value = int(current["value"])
+        classification = current.get("value_classification", "")
+
+        recent = [int(e["value"]) for e in entries[:30]]
+
+        return {
+            "value": value,
+            "classification": classification,
+            "recent": recent,
+        }
+    except Exception as e:
+        log.error("Fear & Greed fetch error: %s", e)
+        return {"value": None, "error": str(e)}