feat: login-free Stockbit intraday and quote provider

Read Stockbit's public symbol page (__NEXT_DATA__) with a plain ureq
request and an honest user agent: `stocks intraday` (today by the
minute, any provider), `--provider stockbit` quotes with the best
bid/offer only while the market is open, and MCP `get_intraday`.

- UPSTREAMBLOCKED error (exit 4) for a CDN 403; never retried
- requests paced 1 s apart across idx processes, 5 s snapshot cache
- global --provider flag (yahoo, msn, stockbit)
- roadmap: L1 ships from Stockbit; depth stays a login follow-on

crates/idx-core/tests/fixtures/stockbit_blocked_403.html

@@ -0,0 +1,20 @@
+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<HTML><HEAD><META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1">
+<TITLE>ERROR: The request could not be satisfied</TITLE>
+</HEAD><BODY>
+<H1>403 ERROR</H1>
+<H2>The request could not be satisfied.</H2>
+<HR noshade size="1px">
+Request blocked.
+We can't connect to the server for this app or website at this time. There might be too much traffic or a configuration error. Try again later, or contact the app or website owner.
+<BR clear="all">
+If you provide content to customers through CloudFront, you can find steps to troubleshoot and help prevent this error by reviewing the CloudFront documentation.
+<BR clear="all">
+<HR noshade size="1px">
+<PRE>
+Generated by cloudfront (CloudFront)
+Request ID: VajZoZu7lzhasdjnxU37dHaztROLXHQ6DMpJzTPZoDhkd4I2dVc2mw==
+</PRE>
+<ADDRESS>
+</ADDRESS>
+</BODY></HTML>

crates/idx-core/tests/fixtures/stockbit_symbol_maba.html

@@ -0,0 +1 @@
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><title>Stockbit</title></head><body><div id="__next"></div><script id="__NEXT_DATA__" type="application/json">{"props":{"pageProps":{"symbol":"MABA","company":{"symbol":"MABA","name":"Marga Abhinaya Abadi Tbk","price":"50","previous":"50","change":"0.00","percentage":0,"volume":"0","date":"22 Oct 2026","time":"Thu 04:07","updated":"2022-10-17T01:22:50+07:00","status":"STATUS_SUSPENDED","tradeable":0,"type_company":"Saham","exchange":"IDX","orderbook":{"bid":{"price":"N/A","volume":"N/A"},"offer":{"price":"N/A","volume":"N/A"}},"market_hour":{"status":"close","time_left":52792,"formatted_time_left":"14 jam 39 menit 52 detik","suspend_info":""}},"chart":{"cagr":"","change":0,"drawdown":"","markingpoint":"","percentage":"","prices":[],"timeframe":"today","xaxisopt":"","previous":50,"line_weight":0,"previous_timeframe_price":null,"chart_type":"PRICE_CHART_TYPE_UNSPECIFIED","interval_in_minutes":0,"allowed_chart_type":[],"max_candles":0}},"__N_SSP":true},"page":"/symbol/[symbol]","query":{"symbol":"MABA"},"buildId":"v3.54.5","isFallback":false,"gssp":true}</script></body></html>

crates/idx-core/tests/fixtures/stockbit_symbol_myrx.html

@@ -0,0 +1 @@
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><title>Stockbit</title></head><body><div id="__next"></div><script id="__NEXT_DATA__" type="application/json">{"props":{"pageProps":{"symbol":"MYRX","company":{"symbol":"MYRX","name":"Hanson International Tbk.","price":"50","previous":"50","change":"0.00","percentage":0,"volume":"0","date":"21 Jul 2025","time":"Mon 07:56","updated":"2025-07-21T08:53:24+07:00","status":"STATUS_DELISTED","tradeable":0,"type_company":"Saham","exchange":"IDX","orderbook":{"bid":{"price":"N/A","volume":"N/A"},"offer":{"price":"N/A","volume":"N/A"}},"market_hour":{"status":"close","time_left":52561,"formatted_time_left":"14 jam 36 menit 1 detik","suspend_info":""}},"chart":{"cagr":"","change":0,"drawdown":"","markingpoint":"","percentage":"","prices":[],"timeframe":"today","xaxisopt":"","previous":50,"line_weight":0,"previous_timeframe_price":null,"chart_type":"PRICE_CHART_TYPE_UNSPECIFIED","interval_in_minutes":0,"allowed_chart_type":[],"max_candles":0}},"__N_SSP":true},"page":"/symbol/[symbol]","query":{"symbol":"MYRX"},"buildId":"v3.54.5","isFallback":false,"gssp":true}</script></body></html>

crates/idx-core/tests/fixtures/stockbit_symbol_zzzz_404.html

@@ -0,0 +1 @@
+<!DOCTYPE html><html lang="en"><head><meta charSet="utf-8"/><title>Error | Stockbit - Investasi Saham Bersama Komunitas Saham Terbesar di Indonesia</title></head><body><div id="__next"></div><script id="__NEXT_DATA__" type="application/json">{"props":{"pageProps":{},"__N_SSP":true},"page":"/404","query":{},"buildId":"v3.54.5","isFallback":false,"gssp":true}</script></body></html>