fix(observability): repair Grafana Authentik OAuth2 relying-party login

The Authentik SSO button returned "Server Error" (500) because the grafana
provider authorization_flow was NULL and the authorize view crashed building a
None flow planner. After that, the login failed with "InternalError": no email
claim reached Grafana, so it fell back to GET <api_url>/emails, which authentik
404s.

Unit env: request authentik real scopes (openid email profile, not the GitLab
user:email that crashes the authorize view); read claims from the id_token
(USE_ID_TOKEN=true) and drop ?api=1 from the API URL (Grafana v13 turns it into
a /emails 404); pin email/sub/preferred_username attribute paths; allow
first-login provisioning since the Anubis->Authentik guard fronts the callback.

scripts/authentik-grafana-sso-fix.sh idempotently re-applies the two IdP-side
causes (NULL authorization_flow; the grafana-email-scope mapping that returned
a bare string instead of {"email":..}). Verified end to end: RP login lands on /
and /api/user answers 200 with the real email, user provisioned as Viewer.

scripts/authentik-grafana-sso-fix.sh

@@ -0,0 +1,81 @@
+#!/usr/bin/env bash
+# Repair the Grafana OAuth2 relying-party SSO on Dankclaw's authentik.
+#
+# grafana.franksdank.cloud logs in through authentik as an OAuth2 relying party.
+# Two DB-side facts (the provider was created by hand via `ak shell`, never
+# repo-managed) silently broke that login, and BOTH had previously been
+# mis-recorded here as a single "the property-mapping evaluator is broken, so
+# userinfo returns only `sub`" myth. They are neither, and the evaluator is fine:
+#
+#   1. provider.authorization_flow was NULL. The authorize view builds a flow
+#      planner from it and crashes with
+#      `AttributeError: 'NoneType' object has no attribute 'slug'` — an HTTP 500
+#      "Server Error — Powered by authentik", before any claim is touched.
+#      Fix: point it at default-provider-authorization-implicit-consent, the
+#      flow every other provider in this instance already uses.
+#   2. The `grafana-email-scope` ScopeMapping's expression was the bare string
+#      `user.email`. authentik merges a scope mapping's result into the token as
+#      a MAPPING: a returned dict adds its keys as claims; a returned string is
+#      keyed under the mapping's NAME ("grafana-email-scope"), so no `email`
+#      claim is ever emitted. Grafana, finding no email, falls back to
+#      GET <api_url>/emails, authentik 404s that path, and the login dies with
+#      "Login failed: InternalError". Fix: return
+#      {"email": user.email, "email_verified": True} — the shape the stock
+#      OpenID 'email' mapping uses. The dict-valued `grafana-profile-scope`
+#      mapping has always worked, which is the proof the evaluator is fine.
+#
+# This is authentik DB state. It is NOT in any deployable file: a blueprint
+# re-import, or an ak-shell re-creation of the grafana provider, reverts BOTH
+# facts and the symptom returns verbatim. Re-run this after any such rebuild.
+# Every step is idempotent.
+#
+# Grafana's own half — SCOPES="openid email profile", USE_ID_TOKEN=true, no
+# `?api=1` on the API URL, ALLOW_SIGN_UP=true — lives in
+# dankclaw/observability/quadlet/grafana.container and deploys normally.
+#
+# Usage: authentik-grafana-sso-fix.sh          (override host: AUTHENTIK_HOST=…)
+set -euo pipefail
+HOST="${AUTHENTIK_HOST:-dankclaw}"
+
+ssh "$HOST" 'podman exec -i authentik-server ak shell' <<'PYEOF'
+from authentik.flows.models import Flow
+from authentik.providers.oauth2.models import OAuth2Provider
+
+p = OAuth2Provider.objects.filter(name="grafana").first()
+if not p:
+    raise SystemExit("no OAuth2Provider named 'grafana'")
+
+# 1. The authorization flow every other provider uses.
+want = Flow.objects.filter(slug="default-provider-authorization-implicit-consent").first()
+if not want:
+    raise SystemExit("default-provider-authorization-implicit-consent flow is missing")
+if p.authorization_flow_id != want.pk:
+    p.authorization_flow = want
+    p.save()
+    print(f"set grafana.authorization_flow -> {want.slug}")
+else:
+    print(f"grafana.authorization_flow already {want.slug}")
+
+# 2. The email scope mapping must RETURN A DICT, not a bare string.
+m = p.property_mappings.filter(name="grafana-email-scope").first()
+if not m:
+    raise SystemExit("grafana-email-scope mapping is missing")
+fixed = 'return {"email": user.email, "email_verified": True}'
+if m.expression.strip() != fixed:
+    m.expression = fixed
+    m.save()
+    print("repaired grafana-email-scope -> returns {email, email_verified}")
+else:
+    print("grafana-email-scope expression already correct")
+
+# 3. The id_token must carry the scope claims; Grafana reads identity from it.
+if not p.include_claims_in_id_token:
+    p.include_claims_in_id_token = True
+    p.save()
+    print("enabled include_claims_in_id_token")
+else:
+    print("include_claims_in_id_token already on")
+PYEOF
+
+echo "Done. Verify: sign in at https://grafana.franksdank.cloud via Authentik;"
+echo "the round trip must land on / and /api/user must answer 200 with an email."