feat: Add build scripts and runtime config support

Backend:
- Add setup-backend.sh/bat for one-click backend setup
- Fix test_auth.py mock settings (JWT_EXPIRE_HOURS)
- Fix test_excel_export.py TEMPLATE_DIR reference

Frontend:
- Add config.json for runtime API URL configuration
- Add init.js and settings.js for config loading
- Update main.js to load config from external file
- Update api.js to use dynamic API_BASE_URL
- Update all pages to initialize config before API calls
- Update package.json with extraResources for config

Build:
- Add build-client.sh/bat for packaging Electron + Sidecar
- Add build-all.ps1 PowerShell script with -ApiUrl parameter
- Add GitHub Actions workflow for Windows builds
- Add scripts/README.md documentation

This allows IT to configure backend URL without rebuilding.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

client/src/services/api.js

@@ -1,5 +1,34 @@
-const API_BASE_URL = import.meta.env.VITE_API_BASE_URL || "http://localhost:8000/api";
-const UPLOAD_TIMEOUT = parseInt(import.meta.env.VITE_UPLOAD_TIMEOUT || "600000", 10);
+/**
+ * API Service Module
+ *
+ * API base URL and settings are loaded from external config at runtime,
+ * allowing deployment configuration without rebuilding.
+ */
+
+// Settings will be loaded from config.json via Electron IPC
+let API_BASE_URL = "http://localhost:8000/api";
+let UPLOAD_TIMEOUT = 600000;
+let _settingsLoaded = false;
+
+/**
+ * Initialize API settings from external config
+ * Called by Electron preload or at app startup
+ */
+export async function initializeApi(settings) {
+  if (settings) {
+    API_BASE_URL = settings.apiBaseUrl || API_BASE_URL;
+    UPLOAD_TIMEOUT = settings.uploadTimeout || UPLOAD_TIMEOUT;
+    _settingsLoaded = true;
+    console.log("API initialized with:", { API_BASE_URL, UPLOAD_TIMEOUT });
+  }
+}
+
+/**
+ * Get current API base URL
+ */
+export function getApiBaseUrl() {
+  return API_BASE_URL;
+}
 
 let authToken = null;
 let tokenRefreshTimer = null;

client/src/services/init.js

@@ -0,0 +1,39 @@
+/**
+ * App Initialization Module
+ *
+ * Loads configuration from Electron main process and initializes API settings.
+ * Should be imported and called at the start of every page.
+ */
+
+import { initializeApi } from './api.js';
+
+let _initialized = false;
+
+/**
+ * Initialize the app with configuration from main process
+ * Call this at the start of every page
+ */
+export async function initApp() {
+  if (_initialized) return;
+
+  try {
+    // Get config from Electron main process
+    if (window.electronAPI?.getConfig) {
+      const config = await window.electronAPI.getConfig();
+      await initializeApi(config);
+      console.log("App initialized with config:", config);
+    } else {
+      console.warn("electronAPI not available, using defaults");
+    }
+    _initialized = true;
+  } catch (error) {
+    console.error("Failed to initialize app:", error);
+  }
+}
+
+/**
+ * Check if app is initialized
+ */
+export function isInitialized() {
+  return _initialized;
+}