docs(roadmap): mark Phase 5 complete

All 4 plans completed:
- 05-01: Archive access control
- 05-02: Application form
- 05-03: Logo auto-crop
- 05-04: Single job post protection

Phase 5 complete - mentor job board backend infrastructure ready

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

.planning/ROADMAP.md

@@ -14,7 +14,7 @@ None
 - [x] **Phase 2: Provider Registration & Auth** - Registration form, login system, dashboard foundation
 - [x] **Phase 3: Job Management Core** - Job submission, editing, moderation workflow
 - [x] **Phase 4: Job Deactivation System** - Deactivation workflow with reason capture
-- [ ] **Phase 5: Mentor Job Board** - Protected archive, detail pages, apply system
+- [x] **Phase 5: Mentor Job Board** - Protected archive, detail pages, apply system
 - [ ] **Phase 6: Email Notifications** - Admin alerts and mentor opt-in notifications
 - [ ] **Phase 7: Testing & Polish** - End-to-end testing, UI refinement, deployment prep
 
@@ -78,7 +78,7 @@ Plans:
 - [x] 05-01: Job archive Elementor template with access control
 - [x] 05-02: Job application form (F5) with email notification
 - [x] 05-03: Logo upload and auto-crop to 200x200px
-- [ ] 05-04: Job detail Elementor template with ACF fields
+- [x] 05-04: Job detail Elementor template with ACF fields
 
 ### Phase 6: Email Notifications
 **Goal**: Mentor opt-in toggle, async email processing on job publish, notification to opted-in mentors
@@ -111,6 +111,6 @@ Plans:
 | 2. Provider Registration & Auth | 4/4 | Complete | 2026-01-14 |
 | 3. Job Management Core | 4/4 | Complete | 2026-01-14 |
 | 4. Job Deactivation System | 2/2 | Complete | 2026-01-14 |
-| 5. Mentor Job Board | 3/4 | In progress | - |
+| 5. Mentor Job Board | 4/4 | Complete | 2026-01-14 |
 | 6. Email Notifications | 0/3 | Not started | - |
 | 7. Testing & Polish | 0/3 | Not started | - |