Point dta_webapp webroot at realpath.app paths (closes #12) (#13)

## Summary
- Change `dta_webapp` `webroot_pattern` from `/var/www/{env}.app.ditchtheagent/html` → `/var/www/{env}.realpath.app/html`
- Update `IMPLEMENTATION.md` references to match
- **web-static:** before `compose up`, `docker rm -f` any container publishing the static host ports (`docker ps --filter publish=<port>`), then force-recreate when cleanup ran — clears orphan/legacy binders while keeping the same ports

Closes #12

Coordinates with [dta_webapp#48](Ditch_The_Agent/dta_webapp#48) / [PR #49](Ditch_The_Agent/dta_webapp#49) (`build:beta`/`build:prod` write to the same dirs; prod uses `prod.realpath.app`).

## Test plan
- [ ] Confirm `app_catalog.dta_webapp.webroot_pattern` expands to beta/prod realpath paths
- [ ] On a host with a leftover container on 8080/8081, run deploy and confirm it is removed and web-static rebinds
- [ ] After merge, redeploy `dta_webapp` beta (and prod when ready) and verify files under `/var/www/{env}.realpath.app/html`
- [ ] Hit web-static ports and confirm new build content servedReviewed-on: #13

roles/web-static/tasks/main.yml

@@ -39,9 +39,34 @@
         mode: "0644"
       register: _compose_file
 
+    # Free host ports before bind. Catches leftover/orphan containers from older
+    # compose projects that still publish 8080/8081/etc. Includes the current
+    # web-static container when present — compose up recreates it next.
+    - name: web-static | find containers publishing static ports
+      ansible.builtin.command:
+        cmd: docker ps -q --filter publish={{ item }}
+      loop: "{{ _static_apps | map(attribute='port') | list | unique }}"
+      register: _port_holders
+      changed_when: false
+      become: true
+
+    - name: web-static | unique container ids on static ports
+      ansible.builtin.set_fact:
+        _stale_port_cids: "{{ _port_holders.results | map(attribute='stdout_lines') | flatten | unique | list }}"
+
+    - name: web-static | remove containers holding static ports
+      ansible.builtin.command:
+        cmd: "docker rm -f {{ _stale_port_cids | join(' ') }}"
+      when: _stale_port_cids | length > 0
+      become: true
+      changed_when: true
+      register: _stale_port_rm
+
     - name: web-static | start container
       ansible.builtin.command:
-        cmd: "docker compose up -d --remove-orphans{{ ' --force-recreate' if (_compose_file is changed) else '' }}"
+        cmd: >-
+          docker compose up -d --remove-orphans
+          {{ '--force-recreate' if (_compose_file is changed or (_stale_port_rm is changed)) else '' }}
         chdir: "{{ web_static_dir }}"
       become: true
       become_user: "{{ admin_user }}"
@@ -53,5 +78,8 @@
         chdir: "{{ web_static_dir }}"
       become: true
       become_user: "{{ admin_user }}"
-      when: _nginx_conf is changed and _compose_file is not changed
+      when:
+        - _nginx_conf is changed
+        - _compose_file is not changed
+        - _stale_port_rm is not changed
       changed_when: true