feat: add E2E test suite with nightly CI, fix dashboard Dockerfile

E2E Tests:
- 17 integration tests covering: health, repos CRUD, findings lifecycle,
  cascade delete (SAST + DAST + pentest), DAST targets, stats overview
- TestServer harness: spins up agent API on random port with isolated
  MongoDB database per test, auto-cleanup
- Added lib.rs to expose agent internals for integration tests
- Nightly CI workflow with MongoDB service container (3 AM UTC)

Tests verify:
- Repository add/list/delete + duplicate rejection + invalid ID handling
- Finding creation, filtering by severity/repo, status updates, bulk updates
- Cascade delete: repo deletion removes all DAST targets, pentest sessions,
  attack chain nodes, DAST findings, SAST findings, and SBOM entries
- DAST target CRUD and empty finding list
- Stats overview accuracy with zero and populated data

Also:
- Fix Dockerfile.dashboard: bump dioxus-cli 0.7.3 → 0.7.4 (compile fix)
- Fix clippy: allow new_without_default for pattern scanners

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

compliance-agent/tests/integration/api/stats.rs

@@ -0,0 +1,111 @@
+use crate::common::TestServer;
+use serde_json::json;
+
+#[tokio::test]
+async fn stats_overview_reflects_inserted_data() {
+    let server = TestServer::start().await;
+
+    // Add a repo
+    server
+        .post(
+            "/api/v1/repositories",
+            &json!({
+                "name": "stats-repo",
+                "git_url": "https://github.com/example/stats-repo.git",
+            }),
+        )
+        .await;
+
+    // Insert findings directly
+    let mongodb_uri = std::env::var("TEST_MONGODB_URI")
+        .unwrap_or_else(|_| "mongodb://root:example@localhost:27017/?authSource=admin".into());
+    let client = mongodb::Client::with_uri_str(&mongodb_uri).await.unwrap();
+    let db = client.database(&server.db_name());
+    let now = mongodb::bson::DateTime::now();
+
+    for (title, severity) in [
+        ("Critical Bug", "critical"),
+        ("High Bug", "high"),
+        ("Medium Bug", "medium"),
+        ("Low Bug", "low"),
+    ] {
+        db.collection::<mongodb::bson::Document>("findings")
+            .insert_one(mongodb::bson::doc! {
+                "repo_id": "test-repo-id",
+                "fingerprint": format!("fp-{title}"),
+                "scanner": "test",
+                "scan_type": "sast",
+                "title": title,
+                "description": "desc",
+                "severity": severity,
+                "status": "open",
+                "created_at": now,
+                "updated_at": now,
+            })
+            .await
+            .unwrap();
+    }
+
+    let resp = server.get("/api/v1/stats/overview").await;
+    assert_eq!(resp.status(), 200);
+
+    let body: serde_json::Value = resp.json().await.unwrap();
+    let data = &body["data"];
+    assert_eq!(data["repositories"], 1);
+    assert_eq!(data["total_findings"], 4);
+    assert_eq!(data["critical"], 1);
+    assert_eq!(data["high"], 1);
+
+    server.cleanup().await;
+}
+
+#[tokio::test]
+async fn stats_update_after_finding_status_change() {
+    let server = TestServer::start().await;
+
+    // Insert a finding
+    let mongodb_uri = std::env::var("TEST_MONGODB_URI")
+        .unwrap_or_else(|_| "mongodb://root:example@localhost:27017/?authSource=admin".into());
+    let client = mongodb::Client::with_uri_str(&mongodb_uri).await.unwrap();
+    let db = client.database(&server.db_name());
+    let now = mongodb::bson::DateTime::now();
+
+    let result = db
+        .collection::<mongodb::bson::Document>("findings")
+        .insert_one(mongodb::bson::doc! {
+            "repo_id": "repo-1",
+            "fingerprint": "fp-stats-test",
+            "scanner": "test",
+            "scan_type": "sast",
+            "title": "Stats Test Finding",
+            "description": "desc",
+            "severity": "high",
+            "status": "open",
+            "created_at": now,
+            "updated_at": now,
+        })
+        .await
+        .unwrap();
+    let finding_id = result.inserted_id.as_object_id().unwrap().to_hex();
+
+    // Stats should show 1 finding
+    let resp = server.get("/api/v1/stats/overview").await;
+    let body: serde_json::Value = resp.json().await.unwrap();
+    assert_eq!(body["data"]["total_findings"], 1);
+
+    // Mark it as resolved
+    server
+        .patch(
+            &format!("/api/v1/findings/{finding_id}/status"),
+            &json!({ "status": "resolved" }),
+        )
+        .await;
+
+    // The finding still exists (status changed, not deleted)
+    let resp = server.get("/api/v1/stats/overview").await;
+    let body: serde_json::Value = resp.json().await.unwrap();
+    // total_findings counts all findings regardless of status
+    assert_eq!(body["data"]["total_findings"], 1);
+
+    server.cleanup().await;
+}