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>

atlas-terminal/supabase/migrations/001_portfolio.sql

@@ -0,0 +1,38 @@
+-- Portfolio positions table
+CREATE TABLE IF NOT EXISTS positions (
+  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+  user_id TEXT NOT NULL,
+  ticker TEXT NOT NULL,
+  company_name TEXT,
+  quantity DECIMAL(15,6) NOT NULL,
+  avg_price DECIMAL(15,4) NOT NULL,
+  currency TEXT DEFAULT 'USD',
+  source TEXT DEFAULT 'manual',
+  created_at TIMESTAMPTZ DEFAULT NOW(),
+  updated_at TIMESTAMPTZ DEFAULT NOW()
+);
+
+-- Watchlist table
+CREATE TABLE IF NOT EXISTS watchlist (
+  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+  user_id TEXT NOT NULL,
+  ticker TEXT NOT NULL,
+  added_at TIMESTAMPTZ DEFAULT NOW()
+);
+
+-- Analysis cache table
+CREATE TABLE IF NOT EXISTS analysis_cache (
+  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+  ticker TEXT NOT NULL,
+  analysis_type TEXT NOT NULL,
+  data JSONB NOT NULL,
+  created_at TIMESTAMPTZ DEFAULT NOW(),
+  expires_at TIMESTAMPTZ NOT NULL
+);
+
+-- Indexes
+CREATE INDEX idx_positions_user ON positions(user_id);
+CREATE INDEX idx_positions_ticker ON positions(ticker);
+CREATE INDEX idx_watchlist_user ON watchlist(user_id);
+CREATE INDEX idx_cache_ticker_type ON analysis_cache(ticker, analysis_type);
+CREATE INDEX idx_cache_expires ON analysis_cache(expires_at);