fix: backfill symbol_demand for sidebar-added symbols + analyst ratings schema fix

- Add await ctx.cache.subscribe() to addSymbol mutation so symbols
  added via the sidebar get registered in symbol_demand and yfinance
  jobs are queued immediately
- Backfill PEP, WYNN, STZ, CELH into symbol_demand + adapter_queue
- Upgrade yahoo-finance2 3.15.3 -> 3.15.4 and pass validateResult:false
  to quoteSummary() to handle Yahoo schema drift
- Add error detail logging for analyst ratings schema failures
- Update .gitignore with common ignores

app/Dockerfile

@@ -0,0 +1,20 @@
+# Investor Flow — Frontend Dockerfile (Next.js)
+FROM node:22-alpine AS frontend
+
+WORKDIR /app
+
+# Install dependencies
+COPY package.json package-lock.json* ./
+RUN npm install --frozen-lockfile || npm install
+
+# Copy app source
+COPY . .
+
+# Build the Next.js app
+RUN npm run build
+
+# Expose frontend port
+EXPOSE 3000
+
+# Start the Next.js server
+CMD ["npm", "run", "start"]