feat: enhance project structure with server and workflow management

- Introduced a new server package with Fastify for handling API requests and workflows.
- Implemented user authentication and authorization with JWT and cookie management.
- Added endpoints for managing workflows, runs, and user accounts.
- Established a dashboard for monitoring workflow status and statistics.
- Included a script sandbox for executing user-defined scripts securely.
- Updated README with setup instructions and API documentation.
- Configured database migrations for user management.
- Enhanced logging capabilities for better traceability.

packages/web/src/theme.jsx

@@ -0,0 +1,27 @@
+import { createContext, useContext, useEffect, useState } from "react";
+
+const ThemeContext = createContext(null);
+
+export function ThemeProvider({ children }) {
+  const [theme, setTheme] = useState(() => {
+    if (typeof localStorage === "undefined") return "light";
+    return localStorage.getItem("theme") || "light";
+  });
+
+  useEffect(() => {
+    document.documentElement.setAttribute("data-theme", theme);
+    localStorage.setItem("theme", theme);
+  }, [theme]);
+
+  const toggle = () => setTheme((t) => (t === "dark" ? "light" : "dark"));
+
+  return (
+    <ThemeContext.Provider value={{ theme, setTheme, toggle }}>
+      {children}
+    </ThemeContext.Provider>
+  );
+}
+
+export function useTheme() {
+  return useContext(ThemeContext);
+}