feat(trajectoire): intégration complète de la page Construire sa trajectoire

- Implémentation des composants React (8 trajectoires, Human Employment Model, méthodologie 6 étapes, Learning by Doing, exemples de projets, compétences)
- Rendu dynamique des cartes via .map()
- Configuration du routage SPA dans Symfony (route catch-all) et React Router (Header Link)
- Ajustements graphiques et CSS conformes au Figma (#F4F1EA, vert olive)

package-lock.json

@@ -8,7 +8,8 @@
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             "dependencies": {
                 "react": "^18.3.1",
-                "react-dom": "^18.3.1"
+                "react-dom": "^18.3.1",
+                "react-router-dom": "^7.18.4"
             },
             "devDependencies": {
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@@ -3040,6 +3041,19 @@
             "dev": true,
             "license": "MIT"
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+            "license": "MIT",
+            "engines": {
+                "node": ">=18"
+            },
+            "funding": {
+                "type": "opencollective",
+                "url": "https://opencollective.com/express"
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         "node_modules/core-js": {
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@@ -5684,6 +5698,44 @@
                 "react": "^18.3.1"
             }
         },
+        "node_modules/react-router": {
+            "version": "7.18.4",
+            "resolved": "https://registry.npmjs.org/react-router/-/react-router-7.18.4.tgz",
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+            "license": "MIT",
+            "dependencies": {
+                "cookie": "^1.0.1",
+                "set-cookie-parser": "^2.6.0"
+            },
+            "engines": {
+                "node": ">=20.0.0"
+            },
+            "peerDependencies": {
+                "react": ">=18",
+                "react-dom": ">=18"
+            },
+            "peerDependenciesMeta": {
+                "react-dom": {
+                    "optional": true
+                }
+            }
+        },
+        "node_modules/react-router-dom": {
+            "version": "7.18.4",
+            "resolved": "https://registry.npmjs.org/react-router-dom/-/react-router-dom-7.18.4.tgz",
+            "integrity": "sha512-yrfmJHIpDG7taCpqKjT1G5B6q3O2K+RN8/fgNf0lTjCwiPbQ0ei6vXX9ZjQR+7ld8Tr7Z5xmyMnZ8YJrphWQUw==",
+            "license": "MIT",
+            "dependencies": {
+                "react-router": "7.18.4"
+            },
+            "engines": {
+                "node": ">=20.0.0"
+            },
+            "peerDependencies": {
+                "react": ">=18",
+                "react-dom": ">=18"
+            }
+        },
         "node_modules/read-cache": {
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@@ -6003,6 +6055,12 @@
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+        "node_modules/set-cookie-parser": {
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+            "resolved": "https://registry.npmjs.org/set-cookie-parser/-/set-cookie-parser-2.7.2.tgz",
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+            "license": "MIT"
+        },
         "node_modules/shallow-clone": {
             "version": "3.0.1",
             "resolved": "https://registry.npmjs.org/shallow-clone/-/shallow-clone-3.0.1.tgz",