fix(build): switch from uber-jar to fast-jar for Docker compatibility

- Change quarkus.package.type from uber-jar to fast-jar
- Add EventShare entity and migration for share tracking
- Add establishment capacity field
- Improve event and establishment services
- Add comprehensive tests

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/test/java/com/lions/dev/resource/EventsResourceTest.java

@@ -0,0 +1,51 @@
+package com.lions.dev.resource;
+
+import io.quarkus.test.junit.QuarkusTest;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+
+import java.util.UUID;
+
+import static io.restassured.RestAssured.given;
+import static org.hamcrest.CoreMatchers.*;
+
+@QuarkusTest
+class EventsResourceTest {
+
+  @Test
+  @DisplayName("POST /events/{id}/share sans événement existant retourne 404")
+  void shareEvent_eventNotFound_returns404() {
+    String eventId = UUID.randomUUID().toString();
+    String userId = UUID.randomUUID().toString();
+
+    given()
+        .queryParam("userId", userId)
+        .when()
+        .post("/events/" + eventId + "/share")
+        .then()
+        .statusCode(404);
+  }
+
+  @Test
+  @DisplayName("GET /events/share-link avec id invalide retourne 404")
+  void getShareLink_eventNotFound_returns404() {
+    String eventId = UUID.randomUUID().toString();
+
+    given()
+        .when()
+        .get("/events/" + eventId + "/share-link")
+        .then()
+        .statusCode(404);
+  }
+
+  @Test
+  @DisplayName("GET /events retourne une liste (200)")
+  void getEvents_returnsOk() {
+    given()
+        .when()
+        .get("/events")
+        .then()
+        .statusCode(200)
+        .body(anyOf(is("[]"), startsWith("[")));
+  }
+}