feat: add optional ticket selection to planning report generation

Add a `numbers` form field to the planning report endpoint, allowing
admins to generate a report for a specific subset of open tickets
instead of always planning all open tickets. The selected numbers are
parsed from a comma-separated string, deduplicated, and passed to the
background job. The job's scope is recorded in the audit log and the
Devii tool description is updated to document the new parameter.

README.md

@@ -82,7 +82,7 @@ devplacepy/
 | `/mute` | Mute/unmute a user: stops them creating notifications for you while their content stays visible |
 | `/leaderboard` | Contributor ranking by total stars earned |
 | `/avatar` | Multiavatar proxy with in-memory cache |
-| `/issues` | Issue tracker backed by Gitea: list/detail/comment/status, AI-enhanced filing, admin planning report of all open tickets, and file attachments on open issues and comments (mirrored to the Gitea tracker) |
+| `/issues` | Issue tracker backed by Gitea: list/detail/comment/status, AI-enhanced filing, an admin planning report over a selectable set of open tickets (each ticket's full text reproduced verbatim so the document hands straight to a coding agent), and file attachments on open issues and comments (mirrored to the Gitea tracker) |
 | `/admin/services` | Background service management (start/stop, config, status, logs) |
 | `/admin/bots` | Admin **Bot Monitor**: a live grid of the latest low-quality screenshot per running bot persona, each labelled with the bot username, persona, and current action, auto-refreshing |
 | `/admin` | Admin panel (user management, news curation, settings) |