feat(project): Complete Project Lifecycle capability with full TDD workflow

- Implement ProjectController with CRUD, status transitions, estimate/forecast
- Add ProjectService with state machine validation
- Extract ProjectStatusService for reusable state machine logic
- Add ProjectPolicy for role-based authorization
- Create ProjectSeeder with test data
- Implement frontend project management UI with modal forms
- Add projectService API client
- Complete all 9 incomplete unit tests (ProjectModelTest, ProjectForecastTest, ProjectPolicyTest)
- Fix E2E test timing issues with loading state waits
- Add Scribe API documentation annotations
- Improve forecasted effort validation messages with detailed feedback

Test Results:
- Backend: 49 passed (182 assertions)
- Frontend Unit: 32 passed
- E2E: 134 passed (Chromium + Firefox)

Phase 3 Refactor:
- Extract ProjectStatusService for state machine
- Optimize project list query with status joins
- Improve forecasted effort validation messages

Phase 4 Document:
- Add Scribe annotations to ProjectController
- Generate API documentation

backend/app/Services/ProjectStatusService.php

@@ -0,0 +1,61 @@
+<?php
+
+namespace App\Services;
+
+/**
+ * Encapsulates the project lifecycle state machine.
+ */
+class ProjectStatusService
+{
+    /**
+     * Valid status transitions for the project state machine.
+     * Key = from status, Value = array of valid target statuses
+     */
+    protected array $statusTransitions = [
+        'Pre-sales' => ['SOW Approval'],
+        'SOW Approval' => ['Estimation', 'Pre-sales'],
+        'Estimation' => ['Estimate Approved', 'SOW Approval'],
+        'Estimate Approved' => ['Resource Allocation', 'Estimate Rework'],
+        'Resource Allocation' => ['Sprint 0', 'Estimate Approved'],
+        'Sprint 0' => ['In Progress', 'Resource Allocation'],
+        'In Progress' => ['UAT', 'Sprint 0', 'On Hold'],
+        'UAT' => ['Handover / Sign-off', 'In Progress', 'On Hold'],
+        'Handover / Sign-off' => ['Closed', 'UAT'],
+        'Estimate Rework' => ['Estimation'],
+        'On Hold' => ['In Progress', 'Cancelled'],
+        'Cancelled' => [],
+        'Closed' => [],
+    ];
+
+    /**
+     * Return the valid target statuses for the provided current status.
+     */
+    public function getValidTransitions(string $currentStatus): array
+    {
+        return $this->statusTransitions[$currentStatus] ?? [];
+    }
+
+    /**
+     * Determine if a transition from the current status to the target is allowed.
+     */
+    public function canTransition(string $currentStatus, string $targetStatus): bool
+    {
+        return in_array($targetStatus, $this->getValidTransitions($currentStatus), true);
+    }
+
+    /**
+     * Return statuses that do not allow further transitions.
+     */
+    public function getTerminalStatuses(): array
+    {
+        return array_keys(array_filter($this->statusTransitions, static fn (array $targets): bool => $targets === []));
+    }
+
+    /**
+     * Determine if a status requires an approved estimate before entering.
+     */
+    public function requiresEstimate(string $statusName): bool
+    {
+        return $statusName === 'Estimate Approved';
+    }
+}