feat: restore CI pipelines and add k3s deployment

Re-enable build/test/format pipelines, rename deploy_server to
deploy_latest, add upload_tag (tag-triggered k3s deploy) and
upload_commit (promote-triggered k3s deploy). Update CLAUDE.md.

.drone.yml

@@ -1,41 +1,59 @@
-# kind: pipeline
-# type: docker
-# name: server_build_and_test
-#
-# steps:
-#   - name: build_server
-#     image: node
-#     commands:
-#       - npm ci -w @calchat/shared
-#       - npm ci -w @calchat/server
-#       - npm run build -w @calchat/server
-#
-#   - name: jest_server
-#     image: node
-#     commands:
-#       - npm run test -w @calchat/server
-#
-# ---
-#
-# kind: pipeline
-# type: docker
-# name: check_for_formatting
-#
-# steps:
-#   - name: format_check
-#     image: node
-#     commands:
-#       - npm ci
-#       - npm run check_format
-#
-# ---
-#
 kind: pipeline
 type: docker
-name: deploy_server
+name: server_build_and_test
+
+trigger:
+  branch:
+    - main
+  event:
+    - push
 
 steps:
-  - name: upload_to_registry
+  - name: build_server
+    image: node
+    commands:
+      - npm ci -w @calchat/shared
+      - npm ci -w @calchat/server
+      - npm run build -w @calchat/server
+
+  - name: jest_server
+    image: node
+    commands:
+      - npm run test -w @calchat/server
+
+---
+
+kind: pipeline
+type: docker
+name: check_for_formatting
+
+trigger:
+  branch:
+    - main
+  event:
+    - push
+
+steps:
+  - name: format_check
+    image: node
+    commands:
+      - npm ci
+      - npm run check_format
+
+---
+
+kind: pipeline
+type: docker
+name: deploy_latest
+
+trigger:
+  branch:
+    - main
+  event:
+    - push
+
+steps:
+  - name: upload_latest
     image: plugins/docker
     settings:
       registry: gitea.gilmour109.de
@@ -43,13 +61,12 @@ steps:
       dockerfile: apps/server/docker/Dockerfile
       tags:
         - latest
-        - main
       username:
         from_secret: gitea_username
       password:
         from_secret: gitea_password
 
-  - name: ssh
+  - name: deploy_to_vps
     image: appleboy/drone-ssh
     settings:
       host:
@@ -67,6 +84,86 @@ steps:
         - docker pull gitea.gilmour109.de/gilmour109/calchat-server:latest
         - docker compose -f /root/calchat-mongo/docker-compose.yml up -d
 
-# depends_on:
-#   - server_build_and_test
-#   - check_for_formatting
+depends_on:
+  - server_build_and_test
+  - check_for_formatting
+
+---
+
+kind: pipeline
+type: docker
+name: upload_tag
+
+trigger:
+  event:
+    - tag
+
+steps:
+  - name: upload_tag
+    image: plugins/docker
+    settings:
+      registry: gitea.gilmour109.de
+      repo: gitea.gilmour109.de/gilmour109/calchat-server
+      dockerfile: apps/server/docker/Dockerfile
+      tags:
+        - ${DRONE_TAG}
+      username:
+        from_secret: gitea_username
+      password:
+        from_secret: gitea_password
+
+  - name: deploy_to_k3s
+    image: appleboy/drone-ssh
+    settings:
+      host:
+        - 192.168.178.201
+      username: debian
+      password:
+        from_secret: k3s_ssh_password
+      envs:
+        - drone_tag
+      port: 22
+      command_timeout: 2m
+      script:
+        - export NAME=$DRONE_TAG
+        - envsubst < /home/debian/manifest.yml | sudo kubectl apply -f -
+
+---
+
+kind: pipeline
+type: docker
+name: upload_commit
+
+trigger:
+  event:
+    - promote
+
+steps:
+  - name: upload_commit
+    image: plugins/docker
+    settings:
+      registry: gitea.gilmour109.de
+      repo: gitea.gilmour109.de/gilmour109/calchat-server
+      dockerfile: apps/server/docker/Dockerfile
+      tags:
+        - ${DRONE_COMMIT_SHA:0:8}
+      username:
+        from_secret: gitea_username
+      password:
+        from_secret: gitea_password
+
+  - name: deploy_to_k3s
+    image: appleboy/drone-ssh
+    settings:
+      host:
+        - 192.168.178.201
+      username: debian
+      password:
+        from_secret: k3s_ssh_password
+      envs:
+        - drone_commit_sha
+      port: 22
+      command_timeout: 2m
+      script:
+        - export NAME=$(echo $DRONE_COMMIT_SHA | cut -c1-8)
+        - envsubst < /home/debian/manifest.yml | sudo kubectl apply -f -