Add global music player, invoicing/payment system, account subpages, mail account admin, and the qualityiron.vegas Jet 2.0 port

Jet interpreter (Tag.cpp, __call.cpp, __imap*.cpp/h, __smtpsend.cpp/h,
__imapemptyfolder.cpp/h - new): assorted parser/tag fixes found across
this work - a stray literal-tag-in-comment and backslash-quote parser
corruption class, a dangling-pointer fix, a __call.cpp fd leak, IMAP
folder-management tags, multi-account/per-host IMAP support, and a
smtpsend Message-ID fix.

barant.com site (jetc/barant-site/):
- A site-wide persistent music player (header band, playlist/queue,
  stereo FFT EQ, session-persisted state) fed by new library/
  ianslibrary/music song-list subpages.
- /account split into info/phones/invoices subpages; a full invoicing
  and Square payment system (create/edit/copy/pay/email invoice);
  admin invoice management and mail-account management subpages.
- /services split into overview/hosting/siptrunking/documents
  subpages, retiring the old standalone pages.
- SIPPHONE.tag: a Jet 2.0 WebRTC softphone tag.
- main.css/spa.js/email.js: the SPA loading indicator, the music
  player band styling, and assorted fixes accumulated alongside this
  work.

qualityiron-site/: the qualityiron.vegas job/contractor/customer/
document management app, ported from its original Jet 1.4 codebase to
Jet 2.0 as barant.coms APIServers second multi-tenant site.

wcwc/wcwc.jet: the WCWC site Jet source (wcwc.jtc build output not
included).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

jetc/barant-site/src/send_invoice_email.method

@@ -0,0 +1,27 @@
+<set name="_send_invoice_id" value="$[invoice_id]">
+<if value1="$[_send_invoice_id]" value2="" type="eq">
+<set name="_send_invoice_id" value="$[@_invoice_id]">
+</if>
+<sql>select u.email as email, u.name as name from invoices i join users u on i.user_id=u.id where i.id=$[_send_invoice_id]</sql>
+<ifrow>
+<set name="_invoice_email_to" value="$[.email]">
+<if value1="$[_invoice_email_override]" value2="" type="ne">
+<set name="_invoice_email_to" value="$[_invoice_email_override]">
+</if>
+<set name="_invoice_id" value="$[_send_invoice_id]">
+<eval name="_invoice_html">
+<include file="invoice.method">
+</eval>
+<eval name="_invoice_email_body">
+<html>
+<head></head>
+<body style="margin: 0; padding: 30px 10px; background: #0a0a0d; font-family: Arial, Helvetica, sans-serif;">
+$[_invoice_html]
+<p style="text-align: center; color: #8d8c92; font-size: 11px; margin-top: 20px;">BARANT Technology Group</p>
+</body>
+</html>
+</eval>
+<eval name="_invoice_smtpsend_discard">
+<smtpsend config="./email.cfg" user="noreply@barant.com" password="NgCe0RolitzgBKVHz2HKfnTd" to="$[_invoice_email_to]" subject="Your BARANT Technology Group Invoice #$[_send_invoice_id]" html="$[_invoice_email_body]">
+</eval>
+</ifrow>