feat: Initialize monorepo structure and comprehensive documentation

This commit establishes the new monorepo architecture for the KROW Workforce platform.

Key changes include:
- Reorganized project into `frontend-web`, `mobile-apps`, `firebase`, `scripts`, and `secrets` directories.
- Updated `Makefile` to support the new monorepo layout and automate Base44 export integration.
- Fixed `scripts/prepare-export.js` for ES module compatibility and global component import resolution.
- Created and updated `CONTRIBUTING.md` for developer onboarding.
- Restructured, renamed, and translated all `docs/` files for clarity and consistency.
- Implemented an interactive internal launchpad with diagram viewing capabilities.
- Configured base Firebase project files (`firebase.json`, security rules).
- Updated `README.md` to reflect the new project structure and documentation overview.

frontend-web/src/components/common/PageHeader.jsx

@@ -0,0 +1,46 @@
+import React from "react";
+import { Link } from "react-router-dom";
+import { createPageUrl } from "@/utils";
+import { ArrowLeft } from "lucide-react";
+import { Button } from "@/components/ui/button";
+
+export default function PageHeader({ 
+  title, 
+  subtitle, 
+  actions = null,
+  backTo = null,
+  backButtonLabel = "Back"
+}) {
+  return (
+    <div className="mb-8">
+      {/* Back Button */}
+      {backTo && (
+        <Link to={backTo} className="inline-block mb-4">
+          <Button variant="ghost" className="hover:bg-slate-100">
+            <ArrowLeft className="w-4 h-4 mr-2" />
+            {backButtonLabel}
+          </Button>
+        </Link>
+      )}
+
+      {/* Main Header */}
+      <div className="flex items-center justify-between">
+        <div>
+          <h1 className="text-3xl md:text-4xl font-bold bg-gradient-to-r from-[#1C323E] to-[#0A39DF] bg-clip-text text-transparent mb-2">
+            {title}
+          </h1>
+          {subtitle && (
+            <p className="text-lg text-slate-600">{subtitle}</p>
+          )}
+        </div>
+
+        {/* Custom Actions (if provided) */}
+        {actions && (
+          <div className="flex items-center gap-2">
+            {actions}
+          </div>
+        )}
+      </div>
+    </div>
+  );
+}