feat: Integrate react-router-dom for routing and enhance App component with new navigation structure

frontend/package-lock.json

@@ -14,7 +14,8 @@
         "bootstrap": "^5.3.7",
         "react": "^19.1.0",
         "react-bootstrap": "^2.10.10",
-        "react-dom": "^19.1.0"
+        "react-dom": "^19.1.0",
+        "react-router-dom": "^6.30.1"
       },
       "devDependencies": {
         "@eslint/js": "^9.29.0",
@@ -563,6 +564,15 @@
         "react": "^16.8.0 || ^17.0.0-rc.1 || ^18.0.0 || ^19.0.0-rc.1"
       }
     },
+    "node_modules/@remix-run/router": {
+      "version": "1.23.0",
+      "resolved": "https://registry.npmjs.org/@remix-run/router/-/router-1.23.0.tgz",
+      "integrity": "sha512-O3rHJzAQKamUz1fvE0Qaw0xSFqsA/yafi2iqeE0pvdFtCO1viYx8QL6f3Ln/aCCTLxs68SLf0KPM9eSeM8yBnA==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=14.0.0"
+      }
+    },
     "node_modules/@restart/hooks": {
       "version": "0.4.16",
       "resolved": "https://registry.npmjs.org/@restart/hooks/-/hooks-0.4.16.tgz",
@@ -2067,6 +2077,38 @@
         "node": ">=0.10.0"
       }
     },
+    "node_modules/react-router": {
+      "version": "6.30.1",
+      "resolved": "https://registry.npmjs.org/react-router/-/react-router-6.30.1.tgz",
+      "integrity": "sha512-X1m21aEmxGXqENEPG3T6u0Th7g0aS4ZmoNynhbs+Cn+q+QGTLt+d5IQ2bHAXKzKcxGJjxACpVbnYQSCRcfxHlQ==",
+      "license": "MIT",
+      "dependencies": {
+        "@remix-run/router": "1.23.0"
+      },
+      "engines": {
+        "node": ">=14.0.0"
+      },
+      "peerDependencies": {
+        "react": ">=16.8"
+      }
+    },
+    "node_modules/react-router-dom": {
+      "version": "6.30.1",
+      "resolved": "https://registry.npmjs.org/react-router-dom/-/react-router-dom-6.30.1.tgz",
+      "integrity": "sha512-llKsgOkZdbPU1Eg3zK8lCn+sjD9wMRZZPuzmdWWX5SUs8OFkN5HnFVC0u5KMeMaC9aoancFI/KoLuKPqN+hxHw==",
+      "license": "MIT",
+      "dependencies": {
+        "@remix-run/router": "1.23.0",
+        "react-router": "6.30.1"
+      },
+      "engines": {
+        "node": ">=14.0.0"
+      },
+      "peerDependencies": {
+        "react": ">=16.8",
+        "react-dom": ">=16.8"
+      }
+    },
     "node_modules/react-transition-group": {
       "version": "4.4.5",
       "resolved": "https://registry.npmjs.org/react-transition-group/-/react-transition-group-4.4.5.tgz",