feat: add Atlas Terminal — Next.js 14 + FastAPI full-stack migration

Complete migration from Streamlit to Next.js 14 App Router + FastAPI backend.

Frontend (Next.js 14):
- 10 pages: Overview, Research, Valuation, Technical, Markets, Earnings, News, Portfolio, Filings, Settings
- Terminal Noir dark theme with custom Tailwind config
- TradingView Lightweight Charts for candlestick/volume
- Valuation: DCF, Sensitivity Matrix, Monte Carlo, Tornado, Reverse DCF
- Financial Statements table with YoY growth badges and margin rows
- SEC EDGAR inline filing viewer with section tabs
- News split-view with iframe article embedding
- Technical Analysis with RSI, MACD, Bollinger, Fibonacci, Moving Averages
- Earnings beat/miss visualization
- AI Copilot chat panel with Gemini integration

Backend (FastAPI):
- 13 routers: market_data, financials, valuation, technical, earnings, insider, edgar, news, portfolio, analysis, chat, estimates, fx
- Services: DCF engine, Monte Carlo simulation, sensitivity analysis, risk metrics, SEC parser, technical indicators
- yfinance + yahooquery data sources with fallback pattern
- SQLite caching layer

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

data/market.py

@@ -90,10 +90,11 @@ def _get_ticker_bar_data() -> list:
 def _fetch_news_rss(ticker_sym: str, company_name: str = "") -> list:
     """Fetch news from Google News RSS. Returns list of {title, source, url, published}."""
     import feedparser
+    from urllib.parse import quote_plus
     items = []
     query = ticker_sym if not company_name else company_name
     try:
-        feed = feedparser.parse(f"https://news.google.com/rss/search?q={query}+stock&hl=en-US&gl=US&ceid=US:en")
+        feed = feedparser.parse(f"https://news.google.com/rss/search?q={quote_plus(query)}+stock&hl=en-US&gl=US&ceid=US:en")
         for entry in (feed.entries or [])[:15]:
             items.append({
                 "title": entry.get("title", ""),