- Add GetTemplateSize RPC to host agent proto with team_id + template_id
- Implement TemplateRootfsSize using block-level stat (Blocks * 512)
for accurate sparse file accounting
- Add resolveTemplateSizes helper that queries a host agent and
persists the result to the DB for subsequent requests
- Wire resolveTemplateSizes into GET /v1/admin/templates and
GET /v1/snapshots so system base templates show correct sizes
- Add UpdateTemplateSize sqlc query
- Remove unused cert_fingerprint / cert_expires_at from host queries
- Add GET /v1/admin/hosts route
pptx704
e061095110