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/server/main.py

@@ -0,0 +1,75 @@
+"""
+ATLAS Terminal — FastAPI Backend
+Unified entry point with PostgreSQL + SQLite support.
+"""
+import os
+import logging
+from contextlib import asynccontextmanager
+from fastapi import FastAPI
+from fastapi.middleware.cors import CORSMiddleware
+
+logging.basicConfig(level=logging.INFO)
+logger = logging.getLogger(__name__)
+
+
+@asynccontextmanager
+async def lifespan(app: FastAPI):
+    """Initialize database on startup, close on shutdown."""
+    from server.db.unified_repo import repo
+    await repo.init_db()
+    logger.info("ATLAS Terminal backend started.")
+    yield
+    await repo.close_db()
+    logger.info("ATLAS Terminal backend stopped.")
+
+
+app = FastAPI(
+    title="ATLAS Terminal API",
+    description="Personal Bloomberg Terminal — Hybrid AI + Quantitative Analysis",
+    version="2.0.0",
+    lifespan=lifespan,
+)
+
+# CORS — allow local frontend
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=[
+        "http://localhost:3000",
+        "http://localhost:3001",
+        "http://127.0.0.1:3000",
+    ],
+    allow_credentials=True,
+    allow_methods=["*"],
+    allow_headers=["*"],
+)
+
+# --- Mount routers ---
+from server.routers import edgar, analysis, valuation, market_data, news, crypto, fx, portfolio, technical, financials, estimates, earnings, insider  # noqa: E402
+
+app.include_router(edgar.router, prefix="/api/edgar", tags=["SEC EDGAR"])
+app.include_router(analysis.router, prefix="/api/analysis", tags=["AI Analysis"])
+app.include_router(valuation.router, prefix="/api/valuation", tags=["Valuation"])
+app.include_router(market_data.router, prefix="/api/market", tags=["Market Data"])
+app.include_router(financials.router, prefix="/api/financials", tags=["Financials"])
+app.include_router(estimates.router, prefix="/api/estimates", tags=["Estimates"])
+app.include_router(news.router, prefix="/api/news", tags=["News"])
+app.include_router(crypto.router, prefix="/api/crypto", tags=["Crypto"])
+app.include_router(fx.router, prefix="/api/fx", tags=["FX"])
+app.include_router(portfolio.router, prefix="/api/portfolio", tags=["Portfolio"])
+app.include_router(technical.router, prefix="/api/technical", tags=["Technical"])
+app.include_router(earnings.router, prefix="/api/earnings", tags=["Earnings"])
+app.include_router(insider.router, prefix="/api/insider", tags=["Insider Trading"])
+
+
+@app.get("/health")
+async def health_check():
+    """Health check endpoint."""
+    db_type = "postgresql" if os.getenv("DATABASE_URL") else "sqlite"
+    return {"status": "ok", "db": db_type, "version": "2.0.0"}
+
+
+@app.get("/api/health")
+async def api_health_check():
+    """Health check endpoint (via /api prefix for Next.js proxy)."""
+    db_type = "postgresql" if os.getenv("DATABASE_URL") else "sqlite"
+    return {"status": "ok", "db": db_type, "version": "2.0.0"}