feat(sprint4): achievements, community goals, hall of fame, profile

4 modules: achievement (15 succès, 5 catégories, 3 paliers), community
(objectifs collectifs + boosts globaux), halloffame (classement mensuel),
profile (titre actif + badges + % progression).

Event-driven: combat/forge/craft émettent des events via @nestjs/event-emitter.
Character entity: +activeTitle, +totalGoldEarned.
Seeds: 15 achievements + 3 community goals.

package-lock.json

@@ -11,6 +11,7 @@
         "@nestjs/common": "^10.0.0",
         "@nestjs/config": "^3.0.0",
         "@nestjs/core": "^10.0.0",
+        "@nestjs/event-emitter": "^3.0.1",
         "@nestjs/jwt": "^10.0.0",
         "@nestjs/platform-express": "^10.0.0",
         "@nestjs/throttler": "^5.0.0",
@@ -1616,6 +1617,19 @@
         }
       }
     },
+    "node_modules/@nestjs/event-emitter": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/@nestjs/event-emitter/-/event-emitter-3.0.1.tgz",
+      "integrity": "sha512-0Ln/x+7xkU6AJFOcQI9tIhUMXVF7D5itiaQGOyJbXtlAfAIt8gzDdJm+Im7cFzKoWkiW5nCXCPh6GSvdQd/3Dw==",
+      "license": "MIT",
+      "dependencies": {
+        "eventemitter2": "6.4.9"
+      },
+      "peerDependencies": {
+        "@nestjs/common": "^10.0.0 || ^11.0.0",
+        "@nestjs/core": "^10.0.0 || ^11.0.0"
+      }
+    },
     "node_modules/@nestjs/jwt": {
       "version": "10.2.0",
       "resolved": "https://registry.npmjs.org/@nestjs/jwt/-/jwt-10.2.0.tgz",
@@ -3826,6 +3840,12 @@
         "node": ">= 0.6"
       }
     },
+    "node_modules/eventemitter2": {
+      "version": "6.4.9",
+      "resolved": "https://registry.npmjs.org/eventemitter2/-/eventemitter2-6.4.9.tgz",
+      "integrity": "sha512-JEPTiaOt9f04oa6NOkc4aH+nVp5I3wEjpHbIPqfgCdD5v5bUzy7xQqwcVO2aDQgOWhI28da57HksMrzK9HlRxg==",
+      "license": "MIT"
+    },
     "node_modules/events": {
       "version": "3.3.0",
       "resolved": "https://registry.npmjs.org/events/-/events-3.3.0.tgz",