Compute all Key Ratios from raw statements, eliminating FMP ratio calls

Added compute_ttm_ratios() which derives all 16 TTM ratios directly from
yfinance quarterly income statements, balance sheets, and cash flow:

  Valuation:  P/E, P/S, P/B, EV/EBITDA, EV/Revenue
  Profitability: Gross/Operating/Net Margin, ROE, ROA, ROIC
  Leverage:  D/E, Current Ratio, Quick Ratio, Interest Coverage
  Dividends: Yield, Payout Ratio

get_key_ratios() no longer calls FMP's /ratios-ttm or /key-metrics-ttm
endpoints, saving ~2 FMP API calls per ticker load (including each Comps
peer). Forward P/E still comes from yfinance info dict (analyst estimate).

This also fixes EV/EBITDA for all tickers (DDOG was 4998x from FMP/yfinance
pre-computed values, now correctly 194x from income statement EBITDA).

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

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