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>

cameleer3-server-app/src/test/resources/application-test.yml

@@ -3,17 +3,15 @@ spring:
     enabled: true
 
 cameleer:
-  indexer:
-    debounce-ms: 100
-
-ingestion:
-  buffer-capacity: 100
-  batch-size: 10
-  flush-interval-ms: 100
-
-agent-registry:
-  ping-interval-ms: 1000
-
-security:
-  bootstrap-token: test-bootstrap-token
-  bootstrap-token-previous: old-bootstrap-token
+  server:
+    indexer:
+      debouncems: 100
+    ingestion:
+      buffercapacity: 100
+      batchsize: 10
+      flushintervalms: 100
+    agentregistry:
+      pingintervalms: 1000
+    security:
+      bootstraptoken: test-bootstrap-token
+      bootstraptokenprevious: old-bootstrap-token