Scanner: expand default watchlist from 15 to 37 sector-diversified names

The previous default leaned heavily on mega-cap tech. EDGE setups
are rarer than that — you want a wider net across sectors to catch
the 1-3 setups per week that actually qualify. Curated to 37 names
that are all optionable mid+ cap with reasonable LEAPS liquidity:

  Indices/ETFs: SPY, QQQ, IWM, DIA, SMH, XLF, XLE, XLK
  Mega-cap tech: AAPL, MSFT, NVDA, GOOGL, META, AMZN
  Semis: AMD, INTC, TSM, AVGO, MU
  High-vol/event-driven: TSLA, NFLX, COIN, PLTR, SHOP, UBER, MARA
  Financials: JPM, BAC, GS, V
  Healthcare: LLY, JNJ, UNH
  Consumer/energy: XOM, WMT, DIS, MCD

Also bumped the per-scan cap from 30 to 100 so users can paste
custom lists up to 100 symbols (the previous 30-cap silently
truncated lists like the new 37-name default).

Full default scan completes in ~3.5s with zero errors and correctly
surfaces only the genuine EDGE setups (live test: NVDA / INTC / AAPL
flag, the other 34 do not).

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

backend/src/routes/options.ts

@@ -526,15 +526,26 @@ optionsRouter.delete("/orders/:id", (c) => {
 // HV30 and IV/HV ratio for each. Highlight spikes where IV >> HV.
 // ---------------------------------------------------------------------------
 const DEFAULT_SCAN_SYMBOLS = [
-  "SPY","QQQ","IWM","DIA",
+  // Indices & sector ETFs (8) — vol-stable references
+  "SPY","QQQ","IWM","DIA","SMH","XLF","XLE","XLK",
+  // Mega-cap tech (6)
   "AAPL","MSFT","NVDA","GOOGL","META","AMZN",
-  "TSLA","AMD","NFLX","COIN","INTC",
+  // Semiconductors (5) — frequent earnings & policy catalysts
+  "AMD","INTC","TSM","AVGO","MU",
+  // High-vol / event-driven (7)
+  "TSLA","NFLX","COIN","PLTR","SHOP","UBER","MARA",
+  // Financials (4)
+  "JPM","BAC","GS","V",
+  // Healthcare (3)
+  "LLY","JNJ","UNH",
+  // Consumer / energy (4)
+  "XOM","WMT","DIS","MCD",
 ];
 
 optionsRouter.get("/scan", async (c) => {
   const symsParam = c.req.query("symbols");
   const symbols = (symsParam ? symsParam.split(",") : DEFAULT_SCAN_SYMBOLS)
-    .map((s) => s.trim().toUpperCase()).filter(Boolean).slice(0, 30);
+    .map((s) => s.trim().toUpperCase()).filter(Boolean).slice(0, 100);
 
   if (symbols.length === 0) return c.json(fail("No symbols to scan"), 400);