feat(team-member): Complete Team Member Management capability

Implement full CRUD operations for team members with TDD approach:

Backend:
- TeamMemberController with REST API endpoints
- TeamMemberService for business logic extraction
- TeamMemberPolicy for authorization (superuser/manager access)
- 14 tests passing (8 API, 6 unit tests)

Frontend:
- Team member list with search and status filter
- Create/Edit modal with form validation
- Delete confirmation with constraint checking
- Currency formatting for hourly rates
- Real API integration with teamMemberService

Tests:
- E2E tests fixed with seed data helper
- All 157 tests passing (backend + frontend + E2E)

Closes #22

frontend/src/lib/services/teamMemberService.ts

@@ -0,0 +1,96 @@
+/**
+ * Team Member Service
+ * 
+ * API operations for team member management.
+ */
+
+import { api } from './api';
+
+export interface TeamMember {
+  id: string;
+  name: string;
+  role_id: number;
+  role?: {
+    id: number;
+    name: string;
+  };
+  hourly_rate: string;
+  active: boolean;
+  created_at: string;
+  updated_at: string;
+}
+
+export interface CreateTeamMemberRequest {
+  name: string;
+  role_id: number;
+  hourly_rate: number;
+  active?: boolean;
+}
+
+export interface UpdateTeamMemberRequest {
+  name?: string;
+  role_id?: number;
+  hourly_rate?: number;
+  active?: boolean;
+}
+
+export interface Role {
+  id: number;
+  name: string;
+  description?: string;
+}
+
+// Team member API methods
+export const teamMemberService = {
+  /**
+   * Get all team members with optional active filter
+   */
+  getAll: (active?: boolean) => {
+    const query = active !== undefined ? `?active=${active}` : '';
+    return api.get<TeamMember[]>(`/team-members${query}`);
+  },
+
+  /**
+   * Get a single team member by ID
+   */
+  getById: (id: string) => 
+    api.get<TeamMember>(`/team-members/${id}`),
+
+  /**
+   * Create a new team member
+   */
+  create: (data: CreateTeamMemberRequest) => 
+    api.post<TeamMember>('/team-members', data),
+
+  /**
+   * Update an existing team member
+   */
+  update: (id: string, data: UpdateTeamMemberRequest) => 
+    api.put<TeamMember>(`/team-members/${id}`, data),
+
+  /**
+   * Delete a team member
+   */
+  delete: (id: string) => 
+    api.delete<{ message: string }>(`/team-members/${id}`),
+};
+
+/**
+ * Format hourly rate as currency
+ */
+export function formatHourlyRate(rate: string | number): string {
+  const numRate = typeof rate === 'string' ? parseFloat(rate) : rate;
+  return new Intl.NumberFormat('en-US', {
+    style: 'currency',
+    currency: 'USD',
+  }).format(numRate);
+}
+
+/**
+ * Format hourly rate per hour (e.g., "$150.00/hr")
+ */
+export function formatHourlyRateWithUnit(rate: string | number): string {
+  return `${formatHourlyRate(rate)}/hr`;
+}
+
+export default teamMemberService;