fix: correct protocol version header, disable SQL logging, document deployment pipeline

- ServerApiClient: use X-Cameleer-Protocol-Version: 1 (server expects "1", not "2")
- Disable Hibernate show-sql in dev profile (too verbose)
- CLAUDE.md: document deployment pipeline architecture, M2M server role in bootstrap,
  runtime-base image in CI

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

src/main/resources/application-dev.yml

@@ -1,3 +1,3 @@
 spring:
   jpa:
-    show-sql: true
+    show-sql: false