feat(v2): tabbed dashboard skeleton + Fleet tab (P9a)

Replaces the v1 single-page super-only dashboard with the v2 operator-
scoped tabbed shell. This is the entry point for the v2 frontend — gets
the operator into a working state where they can register their first
machine and see the v2 endpoints behind a usable UI.

Template — templates/satmachineadmin/index.html (full rewrite):
  - Tab strip: Fleet | Clients | Deposits | Commission | Worklist | Reports
  - Header bar with operator-focused title + refresh button
  - Platform-fee banner reads super-config (visible to all operators)
  - Fleet tab: machines table + add/edit/delete row actions
  - Worklist tab gets a count badge (red) when stuck/errored settlements
    exist; populated by GET /settlements/stuck on load
  - Other tabs land placeholder banners pointing at their P9b–P9g task
  - Add-machine + edit-machine dialogs with full form, including
    fallback_commission_pct note that namechecks lamassu-next#44

JS — static/js/index.js (full rewrite):
  - Vue 3 + Quasar UMD app following the workspace CLAUDE.md conventions
  - ${ } delimiters (Jinja owns {{ }})
  - g.user guards (LNbits 1.4 timing — g.user can be null on initial mount)
  - For typography overrides, inline :style instead of utility classes
    (LNbits theme overrides Quasar's .text-* with !important)
  - Pale bg-*-1 backgrounds paired with explicit dark text class for
    dark-mode legibility
  - LNbits.api.request for all calls; Quasar.Notify for feedback;
    Quasar.copyToClipboard for npub copy
  - Routes wired:
      GET  /api/v1/dca/super-config        → banner readout
      GET  /api/v1/dca/machines            → fleet table
      POST /api/v1/dca/machines            → add modal
      PUT  /api/v1/dca/machines/{id}       → edit modal
      DELETE /api/v1/dca/machines/{id}     → confirm dialog
      GET  /api/v1/dca/settlements/stuck   → worklist tab badge

Deleted the entire v1 surface: lamassu_config form, SSH tunnel settings,
single-config polling controls, quick-deposit form (deposits get their
own tab in P9d), manual transaction dialog (the partial-dispense +
retry endpoints replace it in P9b), distribution drill-down dialog.

Next: P9b (machine detail drawer — settlements list, retry button,
partial-dispense modal, notes panel), P9c (clients tab), P9d (deposits
tab), P9e (commission splits editor), P9g (worklist + CSV reports).

Refs: aiolabs/satmachineadmin#9

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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