docs(phase-2.5): Complete access control implementation

PHASE-2-5-COMPLETE.md

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+# Phase 2.5: Access Control - COMPLETE! ✅
+
+**Completion Date**: 2026-02-15 21:14:00 UTC
+
+## What Was Accomplished
+
+### Four Major Components Implemented
+
+1. ✅ **Permission System**
+   - Permission model with resource-based access control
+   - Three permission levels: Read, Write, Admin
+   - Support for multiple resource types (profiles, health data, lab results, medications)
+   - Audit trail (granted_by tracking)
+
+2. ✅ **Share Management**
+   - Share model for resource sharing between users
+   - Expiration support for temporary shares
+   - Active/inactive status tracking
+   - Full CRUD API endpoints
+
+3. ✅ **Permission Middleware**
+   - has_permission() middleware for route protection
+   - Automatic permission checking based on JWT claims
+   - Resource ID extraction from URL paths
+   - Support for both direct permissions and shares
+
+4. ✅ **Permission Check API**
+   - Check permissions programmatically
+   - Support for all permission levels
+   - Consolidated permission checking (direct + shared)
+
+## API Endpoints
+
+### Share Management (5)
+- POST /api/shares - Create share
+- GET /api/shares - List shares
+- GET /api/shares/:id - Get share details
+- PUT /api/shares/:id - Update share
+- DELETE /api/shares/:id - Revoke share
+
+### Permission Check (1)
+- GET /api/permissions/check - Check if user has permission
+
+## Security Features
+
+- JWT-based authentication required for all endpoints
+- Only resource owners can create/update/delete shares
+- Share recipients can view their shares
+- Permission middleware enforces access control
+- Audit trail for all permission grants
+
+## Project Status
+
+Phase 2.1: ✅ Backend Initialization
+Phase 2.2: ✅ MongoDB & Models
+Phase 2.3: ✅ JWT Authentication
+Phase 2.4: ✅ User Management Enhancement
+Phase 2.5: ✅ Access Control ← COMPLETE
+
+Overall Phase 2 Progress: 75% Complete