feat: Maintenance module, Leads/CRM module, and interactive floor plan seat map

[BigBen-7]

Summary

This PR implements four features assigned to BigBen-7:

[BE-19] Maintenance / Issue Reporting: Backend (#1187)

• New MaintenanceRequest entity with category (EQUIPMENT/FACILITY/SAFETY/OTHER), description, imageUrl, status (OPEN/IN_PROGRESS/RESOLVED), resolvedAt, and resolvedByStaffId fields
• POST /maintenance — member submits a request
• GET /maintenance/mine — member views their own requests (paginated)
• GET /maintenance — admin/staff views all requests (filterable by status, category, workspaceId)
• PATCH /maintenance/:id/status — admin updates status
• GET /maintenance/:id — detail view
• MaintenanceModule registered in AppModule

[FE-18] Maintenance / Issue Reporting: Frontend (#1188)

• /maintenance page listing member's own submissions with category badge, status badge, and submission date
• Report an Issue modal with category dropdown and description textarea
• useSubmitMaintenanceRequest and useGetMyMaintenanceRequests React Query hooks
• /maintenance link added to DashboardSidebar under Help

[BE-20] Leads / CRM Module: Backend (#1189)

• New Lead entity with name, email, phone, company, source (CONTACT_FORM/REFERRAL/WALK_IN/OTHER), status (NEW/CONTACTED/QUALIFIED/CONVERTED/LOST), notes, assignedToStaffId, convertedAt fields with soft-delete support
• GET /leads — paginated, filterable by status, source, assignedToStaffId (admin/staff)
• GET /leads/:id — single lead detail
• PATCH /leads/:id — update status, notes, assigned staff
• POST /leads/:id/convert — marks lead as CONVERTED and sets convertedAt
• DELETE /leads/:id — soft-delete (admin only)
• createFromContactForm() helper for ContactModule integration
• LeadsModule registered in AppModule

[FE-17] Interactive Floor Plan / Seat Map (#1186)

• New /spaces/map page rendering an SVG-based floor plan from GET /floor-plan/active
• Each workspace zone is a clickable rectangle coloured by availability: green (available), amber (<25% remaining), red (full)
• Clicking a zone navigates to /bookings/new?workspaceId=
• "Floor plan coming soon" placeholder when no floor plan is published
• Mobile-friendly with pinch-to-zoom (SVG touch-action)
• Map View toggle button added to the /workspaces listing page
• New FloorPlanCanvas component in frontend/components/floor-plan/

Closes #1187
Closes #1188
Closes #1189
Closes #1186

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