feat(alerting): core enums + AlertScope

cameleer-server-core/src/main/java/com/cameleer/server/core/alerting/AggregationOp.java

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+package com.cameleer.server.core.alerting;
+
+public enum AggregationOp { MAX, MIN, AVG, LATEST }

cameleer-server-core/src/main/java/com/cameleer/server/core/alerting/AlertScope.java

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+package com.cameleer.server.core.alerting;
+
+public record AlertScope(String appSlug, String routeId, String agentId) {
+    public boolean isEnvWide() { return appSlug == null && routeId == null && agentId == null; }
+}

cameleer-server-core/src/main/java/com/cameleer/server/core/alerting/AlertSeverity.java

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+package com.cameleer.server.core.alerting;
+
+public enum AlertSeverity { CRITICAL, WARNING, INFO }

cameleer-server-core/src/main/java/com/cameleer/server/core/alerting/AlertState.java

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+package com.cameleer.server.core.alerting;
+
+public enum AlertState { PENDING, FIRING, ACKNOWLEDGED, RESOLVED }

cameleer-server-core/src/main/java/com/cameleer/server/core/alerting/Comparator.java

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+package com.cameleer.server.core.alerting;
+
+public enum Comparator { GT, GTE, LT, LTE, EQ }

cameleer-server-core/src/main/java/com/cameleer/server/core/alerting/ConditionKind.java

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+package com.cameleer.server.core.alerting;
+
+public enum ConditionKind { ROUTE_METRIC, EXCHANGE_MATCH, AGENT_STATE, DEPLOYMENT_STATE, LOG_PATTERN, JVM_METRIC }

cameleer-server-core/src/main/java/com/cameleer/server/core/alerting/FireMode.java

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+package com.cameleer.server.core.alerting;
+
+public enum FireMode { PER_EXCHANGE, COUNT_IN_WINDOW }

cameleer-server-core/src/main/java/com/cameleer/server/core/alerting/NotificationStatus.java

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+package com.cameleer.server.core.alerting;
+
+public enum NotificationStatus { PENDING, DELIVERED, FAILED }

cameleer-server-core/src/main/java/com/cameleer/server/core/alerting/RouteMetric.java

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+package com.cameleer.server.core.alerting;
+
+public enum RouteMetric { ERROR_RATE, P95_LATENCY_MS, P99_LATENCY_MS, THROUGHPUT, ERROR_COUNT }

cameleer-server-core/src/main/java/com/cameleer/server/core/alerting/TargetKind.java

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+package com.cameleer.server.core.alerting;
+
+public enum TargetKind { USER, GROUP, ROLE }

cameleer-server-core/src/test/java/com/cameleer/server/core/alerting/AlertScopeTest.java

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+package com.cameleer.server.core.alerting;
+
+import org.junit.jupiter.api.Test;
+import static org.assertj.core.api.Assertions.assertThat;
+
+class AlertScopeTest {
+
+    @Test
+    void allFieldsNullIsEnvWide() {
+        var s = new AlertScope(null, null, null);
+        assertThat(s.isEnvWide()).isTrue();
+    }
+
+    @Test
+    void appScoped() {
+        var s = new AlertScope("orders", null, null);
+        assertThat(s.isEnvWide()).isFalse();
+        assertThat(s.appSlug()).isEqualTo("orders");
+    }
+
+    @Test
+    void enumsHaveExpectedValues() {
+        assertThat(AlertSeverity.values()).containsExactly(
+            AlertSeverity.CRITICAL, AlertSeverity.WARNING, AlertSeverity.INFO);
+        assertThat(AlertState.values()).containsExactly(
+            AlertState.PENDING, AlertState.FIRING, AlertState.ACKNOWLEDGED, AlertState.RESOLVED);
+        assertThat(ConditionKind.values()).hasSize(6);
+        assertThat(TargetKind.values()).containsExactly(
+            TargetKind.USER, TargetKind.GROUP, TargetKind.ROLE);
+        assertThat(NotificationStatus.values()).containsExactly(
+            NotificationStatus.PENDING, NotificationStatus.DELIVERED, NotificationStatus.FAILED);
+    }
+}