Migrate config to cameleer.server.* naming convention

Move all configuration properties under the cameleer.server.* namespace
with all-lowercase dot-separated names and mechanical env var mapping
(dots→underscores, uppercase). This aligns with the agent's convention
(cameleer.agent.*) and establishes a predictable pattern across all
components.

Changes:
- Move 6 config prefixes under cameleer.server.*: agent-registry,
  ingestion, security, license, clickhouse, and cameleer.tenant/runtime/indexer
- Rename all kebab-case properties to concatenated lowercase
  (e.g., bootstrap-token → bootstraptoken, jar-storage-path → jarstoragepath)
- Update all env vars to CAMELEER_SERVER_* mechanical mapping
- Fix container-cpu-request/container-cpu-shares mismatch bug
- Remove displayName from AgentRegistrationRequest (redundant with instanceId)
- Update agent container env vars to CAMELEER_AGENT_* convention
- Update K8s manifests and CI workflow for new env var names
- Update CLAUDE.md, HOWTO.md, SERVER-CAPABILITIES.md documentation

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

deploy/overlays/feature/kustomization.yaml

@@ -25,7 +25,7 @@ patches:
                 env:
                   - name: SPRING_DATASOURCE_URL
                     value: "jdbc:postgresql://postgres.cameleer.svc.cluster.local:5432/cameleer3?currentSchema=BRANCH_SCHEMA"
-                  - name: CAMELEER_UI_ORIGIN
+                  - name: CAMELEER_SERVER_SECURITY_UIORIGIN
                     value: "http://BRANCH_SLUG.cameleer.siegeln.net"
   # UI ConfigMap: branch-specific API URL
   - target: