feat(sprint4): agile reports — burndown, velocity, CFD, PDF export

[parth0025]

Sprint 4 — Agile Core II (Reports)

Implements all four Sprint 4 tasks (AHE-3706…3709) on a single branch, off staging.

Included

• S4-01 · Burndown — Sprints/burndown.js now also computes story points (totalPoints + per-day remainingPoints/idealPoints) alongside the existing count/hours; exposed at GET /api/v1/agile/burndown. Frontend BurndownChart.vue (sprint picker, Points/Tasks toggle, ideal vs remaining).
• S4-02 · Velocity — GET /api/v1/agile/velocity (committed vs completed points per sprint + rolling-3 average) + VelocityChart.vue.
• S4-03 · CFD — GET /api/v1/agile/cfd (status-band counts/day, 30d) + CFDChart.vue (stacked area).
• S4-04 · PDF export — POST /api/v1/export/pdf (pdfmake, lazy-loaded, standard fonts). Export PDF on each Reports chart.
• Reports view — a first-class add/removable view in the + View catalog (burndown / velocity / CFD as sub-tabs).

Architecture note

The plan proposed a daily snapshot cron → SPRINT_SNAPSHOTS. I compute the reports on-the-fly from tasks + Task_Status history instead: crons run production-only here (snapshots would never populate during local/dev testing) and history already records the transitions the planned "backfill" would read. Net: no cron, no new collection, testable immediately, zero schema change.

Scope

• New: Modules/AgileReports/, Modules/Export/, frontend/.../Projects/Reports/.
• Modified (additive): Sprints/burndown.js, index.js, package.json(+lock — pdfmake), projectTabs/controller.js (catalog injection), ViewsDropdown.vue, commonFunction.js (Reports icon), en.js (labels), Projects.vue (getView + Reports layout).
• No DB schema change.

Verified

• 208 backend tests pass (no regression); all touched Vue files compile.
• Manual: Reports tab add/remove + burndown render confirmed against production data locally.

Notes / caveats

• npm install required for the PDF endpoint (pdfmake added to deps).
• CFD bands are status categories (Done is exact from completion dates; active bands use current status — history doesn't store per-custom-status transitions).
• Velocity includes all non-deleted sprints (not only "closed").
• Reports labels are English-only for now (other locales fall back).

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