chore: rename cameleer3 to cameleer

Rename Java packages from com.cameleer3 to com.cameleer, module
directories from cameleer3-* to cameleer-*, and all references
throughout workflows, Dockerfiles, docs, migrations, and pom.xml.

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

deploy/overlays/feature/kustomization.yaml

@@ -6,9 +6,9 @@ resources:
   - ingress.yaml
   - init-job.yaml
 images:
-  - name: gitea.siegeln.net/cameleer/cameleer3-server
+  - name: gitea.siegeln.net/cameleer/cameleer-server
     newTag: BRANCH_SHA
-  - name: gitea.siegeln.net/cameleer/cameleer3-server-ui
+  - name: gitea.siegeln.net/cameleer/cameleer-server-ui
     newTag: BRANCH_SHA
 patches:
   # Server Deployment: branch-specific schema, index prefix, UI origin
@@ -16,7 +16,7 @@ patches:
       apiVersion: apps/v1
       kind: Deployment
       metadata:
-        name: cameleer3-server
+        name: cameleer-server
       spec:
         template:
           spec:
@@ -24,13 +24,13 @@ patches:
               - name: server
                 env:
                   - name: SPRING_DATASOURCE_URL
-                    value: "jdbc:postgresql://cameleer-postgres.cameleer.svc.cluster.local:5432/cameleer3?currentSchema=BRANCH_SCHEMA&ApplicationName=BRANCH_SCHEMA"
+                    value: "jdbc:postgresql://cameleer-postgres.cameleer.svc.cluster.local:5432/cameleer?currentSchema=BRANCH_SCHEMA&ApplicationName=BRANCH_SCHEMA"
                   - name: CAMELEER_SERVER_SECURITY_UIORIGIN
                     value: "http://BRANCH_SLUG.cameleer.siegeln.net"
   # UI ConfigMap: branch-specific API URL
   - target:
       kind: ConfigMap
-      name: cameleer3-ui-config
+      name: cameleer-ui-config
     patch: |
       - op: replace
         path: /data/config.js