observability configs: loki delete_request_store, prometheus targets, grafana root URL

- loki: recent releases require compactor.delete_request_store when
  retention is enabled (was crash-looping on start)
- prometheus: scrape targets carried legacy dankclaw.local names with
  URL schemes (invalid); point at published LAN ports and the gitea
  quadlet's published port instead
- grafana: GF_SERVER_ROOT_URL to the canonical HTTPS name
- tests: 3 new seams for the deployed observability configs

tests/caddyfile.bats

@@ -100,3 +100,21 @@ CADDYFILE="$REPO_ROOT/dankclaw/Caddyfile"
     grep -q 'xcaddy build' "$cf"
     grep -q 'github.com/caddy-dns/porkbun' "$cf"
 }
+
+# --- Observability configs (deployed by deploy.sh step 3) ---
+
+@test "no legacy .local service names remain in shared configs or compose" {
+    ! grep -rn 'dankclaw\.local\|dankserver\.local' \
+        "$REPO_ROOT/shared" "$REPO_ROOT/dankclaw/compose.yaml"
+}
+
+@test "loki compactor has a delete_request_store (required when retention is on)" {
+    local loki="$REPO_ROOT/shared/loki/loki-config.yaml"
+    if grep -q 'retention_enabled: true' "$loki"; then
+        grep -q 'delete_request_store:' "$loki"
+    fi
+}
+
+@test "prometheus targets are host:port (no URL schemes)" {
+    ! grep -nE '^\s*-\s*"?http' "$REPO_ROOT/shared/prometheus/prometheus.yml"
+}