feat(sprint5): gantt/timeline view + recurring tasks

[parth0025]

Sprint 5 — Gantt I + Recurring tasks

Implements the Sprint 5 tasks (AHE-3710 / AHE-3714 / AHE-3715) on a single branch off staging.

S5-01 · Gantt library (AHE-3710)

Chose dhtmlx-gantt (GPL) — the only candidate covering all hard requirements out of the box; GPL is compatible with AlianHub's AGPL. ADR: docs/adr/gantt-library.md. Lazy-loaded so it never enters the main bundle.

S5-02 · Gantt / timeline view (AHE-3714)

GanttView.vue — a first-class add/removable project view (keyName GanttView):

• Bars from startDate/DueDate, fed live from the Vuex projectData store.
• Drag/resize → reschedule via a new updateDates task action (PATCH /api/v2/tasks, mirrors updatePoints).
• Dependency arrows from task relations (blocks → finish-to-start); draw/delete → /api/v2/tasks/relations.
• Day/week/month zoom, Unscheduled tray, milestone diamonds (/api/v1/milestone/project/:pid), live socket sync, read-only RBAC.
• Uses the dhtmlx singleton (no destructor()) so reopening the tab re-inits cleanly; init() is guarded.

S5-03 · Recurring tasks (AHE-3715)

• New RECURRING_TASKS collection wired through the mongo-core path (schemaType / collections / schema / createSchema / mongoQueries).
• Modules/RecurringTasks/ — CRUD + a node-schedule cron (every 15 min, prod-only) that instantiates real tasks via taskMongo.create across all companies, plus /run-now & /run-due endpoints so it's testable in dev.
• RecurringTasksManager.vue — create / list / pause / resume / run-now / delete, mounted as an add/removable RecurringTasks view.

Notes

• Gantt / RecurringTasks / Reports views are surfaced in + View via PROJECT_TAB_COMPONENTS DB records (added per-company), not controller injection.
• dhtmlx-gantt added to frontend deps (npm install).
• Additive only — no changes to existing collections' behaviour. 208 backend tests pass; all touched SFCs compile.

Manual / deferred

• README Gantt screenshot is a manual step (needs the running app).
• Unscheduled→scheduled uses a "Schedule" button (not literal drag-onto-canvas).

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