fix: NATS pipeline bugs, add integration tests and service runners

Fix three critical bugs preventing the NATS message pipeline from working:

- FlowProcessor now subscribes to config-push topic (was missing entirely),
  using DeliverPolicy.All to replay config on service restart
- NATS streams use wildcard subjects (tg.flow.>) instead of per-topic
  narrow filters that caused 503 errors on publish
- Subscriber dispatch loop has exponential backoff on errors to prevent
  tight error loops

Add service runner scripts (gateway, config, LLM) and a 7-test
integration suite that verifies config CRUD, WebSocket round-trip,
and full LLM text-completion through the NATS pipeline.

Fix Docker Compose infra: pin Tempo to v2.6.1, remove deprecated Loki
config fields, add user:0 for volume permissions, remap conflicting
ports (FalkorDB 6380, OTLP 4327/4328).

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

ts/deploy/loki/loki-config.yml

@@ -24,9 +24,6 @@ query_range:
         enabled: true
         max_size_mb: 100
 
-limits_config:
-  metric_aggregation_enabled: true
-
 schema_config:
   configs:
     - from: 2024-01-01
@@ -37,16 +34,8 @@ schema_config:
         prefix: index_
         period: 24h
 
-pattern_ingester:
-  enabled: true
-  metric_aggregation:
-    loki_address: localhost:3100
-
 ruler:
   alertmanager_url: http://localhost:9093
 
 frontend:
   encoding: protobuf
-
-analytics:
-  reporting_enabled: false