Add topology auth policies + journey findings notes

Concelier:
- Register Topology.Read, Topology.Manage, Topology.Admin authorization
  policies mapped to OrchRead/OrchOperate/PlatformContextRead/IntegrationWrite
  scopes. Previously these policies were referenced by endpoints but never
  registered, causing System.InvalidOperationException on every topology
  API call.

Gateway routes:
- Simplified targets/environments routes (removed specific sub-path routes,
  use catch-all patterns instead)
- Changed environments base route to JobEngine (where CRUD lives)
- Changed to ReverseProxy type for all topology routes

KNOWN ISSUE (not yet fixed):
- ReverseProxy routes don't forward the gateway's identity envelope to
  Concelier. The regions/targets/bindings endpoints return 401 because
  hasPrincipal=False — the gateway authenticates the user but doesn't
  pass the identity to the backend via ReverseProxy. Microservice routes
  use Valkey transport which includes envelope headers. Topology endpoints
  need either: (a) Valkey transport registration in Concelier, or
  (b) Concelier configured to accept raw bearer tokens on ReverseProxy paths.
  This is an architecture-level fix.

Journey findings collected so far:
- Integration wizard (Harbor + GitHub App): works end-to-end
- Advisory Check All: fixed (parallel individual checks)
- Mirror domain creation: works, generate-immediately fails silently
- Topology wizard Step 1 (Region): blocked by auth passthrough issue
- Topology wizard Step 2 (Environment): POST to JobEngine needs verify
- User ID resolution: raw hashes shown everywhere

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

devops/compose/postgres-init/04-authority-schema.sql

@@ -659,7 +659,9 @@ VALUES
             'platform.context.read', 'platform.context.write',
             'doctor:run', 'doctor:admin', 'ops.health',
             'integration:read', 'integration:write', 'integration:operate', 'registry.admin',
-            'timeline:read', 'timeline:write'],
+            'timeline:read', 'timeline:write',
+            'signer:read', 'signer:sign', 'signer:rotate', 'signer:admin',
+            'trust:read', 'trust:write', 'trust:admin'],
      ARRAY['authorization_code', 'refresh_token'],
      false, true, '{"tenant": "demo-prod"}'::jsonb)
 ON CONFLICT (client_id) DO NOTHING;