Adds the personal producers behind GET /api/notifications without changing its shape:
new assignments (SH-288), unanswered comments on work the user takes part in (SH-289),
@mentions, and decisions on uplifts the user requested (SH-215).
No Vendor treated any non-terminal dispatch as an assigned vendor without
checking IsDeleted, so a soft-deleted dispatch hid the work order from both
No Vendor and Vendor Conflict (the conflict query already drops deleted
dispatches). GetNoVendorAsync and the vendor-reminder assigned-work-order rule
now skip soft-deleted dispatches, keeping the asserted parity between the feed
and the reminders.
Vendor Conflict applied the section cap in vendor-sweep order, so when overlaps
exceeded the limit newer conflicts could be dropped while Count still counted
every work order. VendorConflictsAsync now orders pairs by recency before the
cap, matching the other per-work-order sections.
Adds GET /api/notifications, a per-user read model derived from live
work-order state: Unassigned (grouped, High), No Vendor and Aveta Missing
(per work order, Medium) and Vendor Conflict, account-scoped from claims
and ordered by section severity with a fixed reason tie-break.
