feat: add 67 new endpoints across 10 feature groups

Prerequisite refactor:
- Consolidate duplicate _to_dicts into shared obb_utils.to_list
- Add fetch_historical and first_or_empty helpers to obb_utils

Phase 1 - Local computation (no provider risk):
- Group I: 12 technical indicators (ATR, ADX, Stoch, OBV, Ichimoku,
  Donchian, Aroon, CCI, Keltner, Fibonacci, A/D, Volatility Cones)
- Group J: Sortino, Omega ratios + rolling stats (variance, stdev,
  mean, skew, kurtosis, quantile via generic endpoint)
- Group H: ECB currency reference rates

Phase 2 - FRED/Federal Reserve providers:
- Group C: 10 fixed income endpoints (treasury rates, yield curve,
  auctions, TIPS, EFFR, SOFR, HQM, commercial paper, spot rates,
  spreads)
- Group D: 11 economy endpoints (CPI, GDP, unemployment, PCE, money
  measures, CLI, HPI, FRED search, balance of payments, Fed holdings,
  FOMC documents)
- Group E: 5 survey endpoints (Michigan, SLOOS, NFP, Empire State,
  BLS search)

Phase 3 - SEC/stockgrid/FINRA providers:
- Group B: 4 equity fundamental endpoints (management, dividends,
  SEC filings, company search)
- Group A: 4 shorts/dark pool endpoints (short volume, FTD, short
  interest, OTC dark pool)
- Group F: 3 index/ETF enhanced (S&P 500 multiples, index
  constituents, ETF N-PORT)

Phase 4 - Regulators:
- Group G: 5 regulatory endpoints (COT report, COT search, SEC
  litigation, institution search, CIK mapping)

Security hardening:
- Service-layer allowlists for all getattr dynamic dispatch
- Regex validation on date, country, security_type, form_type params
- Exception handling in fetch_historical
- Callable guard on rolling stat dispatch

Total: 32 existing + 67 new = 99 endpoints, all free providers.

main.py

@@ -32,6 +32,11 @@ from routes_technical import router as technical_router
 from routes_quantitative import router as quantitative_router
 from routes_calendar import router as calendar_router
 from routes_market import router as market_router
+from routes_shorts import router as shorts_router
+from routes_fixed_income import router as fixed_income_router
+from routes_economy import router as economy_router
+from routes_surveys import router as surveys_router
+from routes_regulators import router as regulators_router
 
 logging.basicConfig(
     level=settings.log_level.upper(),
@@ -59,6 +64,11 @@ app.include_router(technical_router)
 app.include_router(quantitative_router)
 app.include_router(calendar_router)
 app.include_router(market_router)
+app.include_router(shorts_router)
+app.include_router(fixed_income_router)
+app.include_router(economy_router)
+app.include_router(surveys_router)
+app.include_router(regulators_router)
 
 
 @app.get("/health", response_model=dict[str, str])