Type-aware security pages (epic)

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Epic: Replace the single /security/{symbol} page with type-specific routes + templates + JS modules for crypto, ETF, index, forex. Stock keeps /security/{sym} unchanged.

Today every non-stock security (BTCUSD, ^DJI, USDGBP, SPY) renders a US-equity-shaped template: Market Cap / P/E / Key People / Financials / Estimates / SEC / stock-only peers. Almost none of which is meaningful.

URL scheme

GET /crypto/BTCUSD   → crypto.html  + crypto.js
GET /index/^DJI      → index.html   + index.js
GET /forex/USDGBP    → forex.html   + forex.js
GET /etf/SPY         → etf.html     + etf.js
GET /security/AAPL   → security.html + info.js   (unchanged)
GET /security/BTCUSD → 301 → /crypto/BTCUSD      (legacy compat)

Child issues

• Foundation — routing + dispatch + legacy redirect + info-shared.js extraction
• Crypto info page (vertical slice)
• ETF info page (vertical slice)
• Index info page (vertical slice)
• Forex info page (vertical slice)

Migrated from

docs/TODO-security-types.md — that file will be deleted on the foundation PR (its content is captured here and in the child issues).

Current state worth keeping

• detectSecurityType() in internal/server/static/info.js:215 already reads profile.exchange (CRYPTO / CCC / FOREX), the ^ prefix (index), and profile.isEtf (ETF). Reuse.
• applySecurityType() (info.js:225) hides Financials / Estimates / SEC for crypto/forex/index. ETFs still see the stock tabs (gap).
• News categories crypto / forex are already wrapped in internal/news/news.go:546-560.
• Universal EOD chart (GetHistoricalPriceLight, news.go:362) works for any symbol FMP indexes.
• Search results already carry Exchange (news.go:18) — we can detect type from search response alone.

Critical gaps

• Single canonical URL, single template — no clean way to give crypto its own affordances without if-soup in info.js.
• ETF tab-hiding never wired.
• News tab shows all 6 categories for every type.
• Sector tab calls /stable/stock-peers, useless for non-stocks. No crypto-peer / index-components / ETF-holdings views.
• Trading pipeline runs the SEC analyst for crypto/forex/index/ETF, wasting Ollama calls.