TICKET-038: Wire publish_dashboard into alloc CLI

[belarusian]

TICKET-038: Wire publish_dashboard into alloc CLI

Module: alloc/cli.py, alloc/lib/publish_dashboard.py
Priority: Medium — completes the dashboard pipeline
Cycle: 21

What's Wrong

alloc.lib.publish_dashboard is implemented and tested but has no entry point
in the main CLI (alloc/cli.py). Users must invoke it via
python -m alloc.lib.publish_dashboard rather than through the unified
alloc command.

Evidence

• alloc/cli.py — no subcommand for dashboard publishing
• alloc/lib/publish_dashboard.py:310 — main() exists but is standalone
• alloc/__main__.py — delegates to alloc.cli.main only

Impact

Users cannot generate HTML dashboards through the primary CLI interface.
The dashboard workflow is fragmented: JSON via alloc, HTML via a separate
module invocation.

Suggestion

Add a --publish-dashboard flag (or subcommand) to alloc/cli.py: