Add Sigvild Gallery wedding photo application with automated deployment and improve Caddy plugin management

roles/sigvild-gallery/tasks/deploy_backend.yml

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+---
+# Backend Deployment Tasks
+
+- name: Build Go binary locally
+  local_action:
+    module: shell
+    cmd: GOOS=linux GOARCH=amd64 go build -o sigvild-gallery .
+    chdir: "{{ sigvild_gallery_local_project_path }}"
+  become: no
+  tags: [backend, build]
+
+- name: Check if binary was built successfully
+  local_action:
+    module: stat
+    path: "{{ sigvild_gallery_local_project_path }}/sigvild-gallery"
+  register: binary_stat
+  become: no
+  tags: [backend, build]
+
+- name: Fail if binary doesn't exist
+  fail:
+    msg: "Failed to build sigvild-gallery binary"
+  when: not binary_stat.stat.exists
+  tags: [backend, build]
+
+- name: Transfer Go binary
+  copy:
+    src: "{{ sigvild_gallery_local_project_path }}/sigvild-gallery"
+    dest: "{{ sigvild_gallery_binary }}"
+    owner: "{{ sigvild_gallery_user }}"
+    group: "{{ sigvild_gallery_user }}"
+    mode: '0755'
+  notify: restart sigvild-gallery
+  tags: [backend]
+
+- name: Create data directory for PocketBase
+  file:
+    path: "{{ sigvild_gallery_data_dir }}"
+    state: directory
+    owner: "{{ sigvild_gallery_user }}"
+    group: "{{ sigvild_gallery_user }}"
+    mode: '0755'
+  tags: [backend]