Implement complete AI Photo Edit tool with mask-scoped regeneration

This commit implements a full-stack AI photo editing application that
allows users to regenerate only selected areas of images using AI.

Features implemented:
- Frontend (React + Fabric.js):
  * Interactive canvas with selection tools (rectangle, ellipse, lasso)
  * Real-time selection preview and editing
  * Mode toggle (A: patch only, B: patch + context)
  * Feather slider for edge blending (0-50px)
  * Prompt input for AI instructions
  * Edit history viewer with revert capability
  * Responsive UI with dark theme

- Backend (FastAPI):
  * RESTful API for projects and edits
  * SQLite database for metadata storage
  * Image processing pipeline with PIL/OpenCV
  * AI provider interface (pluggable)
  * Support for OpenAI, Stability AI, and mock providers
  * Feathered alpha blending for smooth compositing
  * Complete edit history tracking
  * File-based storage for images and edits

- Image Processing:
  * Patch extraction from bounding boxes
  * Mask generation for all selection types
  * Feathered edge blending
  * Patch compositing back to full image
  * No pixels modified outside selection
  * All edits reversible

- Infrastructure:
  * Docker Compose orchestration
  * Production and development configurations
  * Nginx reverse proxy for frontend
  * Hot-reload support for development
  * Volume persistence for data

Architecture follows specification exactly:
- Only selected regions are regenerated
- Full image pixels preserved outside mask
- Two-mode operation (cost vs quality)
- Complete edit history and reversibility
- Self-hosted with external AI API calls

All components are fully functional and ready for deployment.

frontend/src/utils/api.js

@@ -0,0 +1,88 @@
+import axios from 'axios';
+
+const API_BASE_URL = import.meta.env.VITE_API_BASE_URL || 'http://localhost:8000';
+
+const api = axios.create({
+  baseURL: API_BASE_URL,
+  headers: {
+    'Content-Type': 'application/json',
+  },
+});
+
+export const projectsApi = {
+  // Create a new project
+  create: async (name) => {
+    const response = await api.post('/projects/', { name });
+    return response.data;
+  },
+
+  // List all projects
+  list: async () => {
+    const response = await api.get('/projects/');
+    return response.data;
+  },
+
+  // Get a specific project
+  get: async (projectId) => {
+    const response = await api.get(`/projects/${projectId}`);
+    return response.data;
+  },
+
+  // Delete a project
+  delete: async (projectId) => {
+    const response = await api.delete(`/projects/${projectId}`);
+    return response.data;
+  },
+
+  // Upload image to project
+  uploadImage: async (projectId, file) => {
+    const formData = new FormData();
+    formData.append('file', file);
+
+    const response = await api.post(`/projects/${projectId}/upload`, formData, {
+      headers: {
+        'Content-Type': 'multipart/form-data',
+      },
+    });
+    return response.data;
+  },
+
+  // Get edits for a project
+  getEdits: async (projectId) => {
+    const response = await api.get(`/projects/${projectId}/edits`);
+    return response.data;
+  },
+
+  // Get image URLs
+  getOriginalImageUrl: (projectId) => `${API_BASE_URL}/projects/${projectId}/original`,
+  getCurrentImageUrl: (projectId) => `${API_BASE_URL}/projects/${projectId}/current`,
+  getEditResultUrl: (projectId, editId) => `${API_BASE_URL}/projects/${projectId}/history/${editId}/result`,
+};
+
+export const editsApi = {
+  // Create a new edit (Fix button)
+  create: async (projectId, editData) => {
+    const response = await api.post(`/edits/projects/${projectId}/fix`, editData);
+    return response.data;
+  },
+
+  // Get edit status
+  get: async (editId) => {
+    const response = await api.get(`/edits/${editId}`);
+    return response.data;
+  },
+
+  // Revert to a specific edit
+  revert: async (projectId, editId) => {
+    const response = await api.post(`/edits/projects/${projectId}/revert/${editId}`);
+    return response.data;
+  },
+
+  // Reset to original
+  reset: async (projectId) => {
+    const response = await api.post(`/edits/projects/${projectId}/reset`);
+    return response.data;
+  },
+};
+
+export default api;