feat(node-agent): add runtime overrides for piha, solaria, chelsty-infra

- piha: NODE_TYPE=sd_card (rate-limited docker prune, once per day)
- solaria: NODE_TYPE=ai_node (dangling+containers+build cache; never -a to preserve Ollama images)
- chelsty-infra: NODE_TYPE=lte_node (NO cleanup, events-only)
- All three: VPS_EVENTS_HOST set for event shipping via rsync+SSH

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

hosts/chelsty-infra/runtime/node-agent/docker-compose.override.yml

@@ -0,0 +1,9 @@
+services:
+  node-agent:
+    environment:
+      - NODE_NAME=chelsty-infra
+      - NODE_TYPE=lte_node
+      - VPS_EVENTS_HOST=100.108.208.3
+      - VPS_EVENTS_USER=oskar
+      - VPS_EVENTS_PATH=/opt/homelab/events
+      - CHECK_INTERVAL=60

hosts/piha/runtime/node-agent/docker-compose.override.yml

@@ -0,0 +1,9 @@
+services:
+  node-agent:
+    environment:
+      - NODE_NAME=piha
+      - NODE_TYPE=sd_card
+      - VPS_EVENTS_HOST=100.108.208.3
+      - VPS_EVENTS_USER=oskar
+      - VPS_EVENTS_PATH=/opt/homelab/events
+      - CHECK_INTERVAL=60

hosts/solaria/runtime/node-agent/docker-compose.override.yml

@@ -0,0 +1,9 @@
+services:
+  node-agent:
+    environment:
+      - NODE_NAME=solaria
+      - NODE_TYPE=ai_node
+      - VPS_EVENTS_HOST=100.108.208.3
+      - VPS_EVENTS_USER=oskar
+      - VPS_EVENTS_PATH=/opt/homelab/events
+      - CHECK_INTERVAL=60