feat: Stockbit login for the order book, live quotes and daily history

Opt-in, with the user's own Stockbit session from a pasted
credentialStorage cookie (or IDX_STOCKBIT_REFRESH_TOKEN):

- idx stockbit login/status/logout; session file 0600, tokens never shown
- rotating refresh under a cross-process lock; one refresh+retry on 401
- stocks orderbook: depth with lots and orders, OHLC, value, foreign flow
- --provider stockbit quotes from the session API when logged in
- --history-provider stockbit, and auto under the stockbit provider for
  5d-1y daily windows
- MCP get_orderbook and stockbit_status (17 tools)

Endpoints, units and recorded responses from fzn0x/idx (MIT).

README.md

@@ -91,12 +91,14 @@ idx ownership changes --from 2026-07-31 --to 2026-08-31
 - Analysis: `technical`, `growth`, `valuation`, `risk`, and a combined
   `fundamental` report; multi-symbol `compare`; MSN stock `screen`
 - Providers: MSN is the default for quotes, fundamentals, and screening;
-  Yahoo serves history. Switch with `--provider`/`IDX_PROVIDER=msn|yahoo` and
-  `IDX_HISTORY_PROVIDER=auto|yahoo|msn`
-- Stockbit, opt-in and without a login: `stocks intraday` (today's price by
-  the minute) and `--provider stockbit` quotes with the best bid/offer while
-  the market is open. Delayed at least 10 minutes, for personal use under
-  Stockbit's terms; see the [Stockbit page](https://idx.rasyidanaf.com/cli/stockbit/)
+  Yahoo serves history. Switch with `--provider`/`IDX_PROVIDER=msn|yahoo|stockbit`
+  and `IDX_HISTORY_PROVIDER=auto|yahoo|msn|stockbit`
+- Stockbit, opt-in: without a login, `stocks intraday` (today's price by the
+  minute) and `--provider stockbit` quotes with the best bid/offer while the
+  market is open, delayed at least 10 minutes. With your own account
+  (`idx stockbit login`): `stocks orderbook` depth and foreign flow, live
+  quotes and Stockbit daily history. Personal use under Stockbit's terms; see
+  the [Stockbit page](https://idx.rasyidanaf.com/cli/stockbit/)
 - Local file cache with TTL, and `--offline` mode with stale-cache fallback
 
 ### Ownership (KSEI shareholders above 1%)
@@ -163,8 +165,8 @@ change it to `auto` with `idx config set general.output auto`.
 
 ## MCP server
 
-`idx-mcp` serves the same data to MCP clients over stdio, as 15 tools:
-`get_quotes`, `get_intraday`, `get_price_history`, `screen_stocks`, `get_company`,
+`idx-mcp` serves the same data to MCP clients over stdio, as 17 tools:
+`get_quotes`, `get_intraday`, `get_orderbook`, `stockbit_status`, `get_price_history`, `screen_stocks`, `get_company`,
 `analyze_stock`, `compare_stocks`, `get_broker_summary`, `analyze_bandar`,
 `get_foreign_flow`, `get_shareholders`, `get_investor_holdings`,
 `search_investors`, `get_ownership_changes`, and `ownership_status`. Live results come wrapped as