Add tailscale_serve ansible role for Layer 2 IaC

- Manage tailscale serve configuration declaratively via ansible
- Define services in defaults/main.yml (grafana, forge, kiwix, pypi)
- Role depends on service roles to ensure correct execution order
- Incremental idempotency: only apply if service missing

Two-layer tailnet IaC is now complete:
- Layer 1 (Pulumi): ACLs, tags, DNS
- Layer 2 (Ansible): tailscale serve config

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

ansible/playbooks/indri.yml

@@ -26,3 +26,5 @@
       tags: devpi_metrics
     - role: plex_metrics
       tags: plex_metrics
+    - role: tailscale_serve
+      tags: tailscale-serve

ansible/roles/tailscale_serve/defaults/main.yml

@@ -0,0 +1,27 @@
+---
+# Tailscale serve configuration for this host
+# Each service maps a Tailscale service name to local endpoints
+
+tailscale_services:
+  - name: svc:grafana
+    https:
+      port: 443
+      upstream: http://localhost:3000
+
+  - name: svc:forge
+    https:
+      port: 443
+      upstream: http://localhost:3001
+    tcp:
+      port: 22
+      upstream: tcp://localhost:2200
+
+  - name: svc:kiwix
+    https:
+      port: 443
+      upstream: http://localhost:5501
+
+  - name: svc:pypi
+    https:
+      port: 443
+      upstream: http://127.0.0.1:3141

ansible/roles/tailscale_serve/meta/main.yml

@@ -0,0 +1,6 @@
+---
+dependencies:
+  - role: grafana
+  - role: forgejo
+  - role: kiwix
+  - role: devpi

ansible/roles/tailscale_serve/tasks/main.yml

@@ -0,0 +1,25 @@
+---
+- name: Get current tailscale serve status
+  ansible.builtin.command: tailscale serve status --json
+  register: serve_status
+  changed_when: false
+
+- name: Configure HTTPS services
+  ansible.builtin.command: >
+    tailscale serve --service="{{ item.name }}"
+    --https={{ item.https.port }} {{ item.https.upstream }}
+  loop: "{{ tailscale_services }}"
+  when: item.https is defined
+  register: https_result
+  changed_when: "'already serving' not in https_result.stderr | default('')"
+  failed_when: false
+
+- name: Configure TCP services
+  ansible.builtin.command: >
+    tailscale serve --service="{{ item.name }}"
+    --tcp={{ item.tcp.port }} {{ item.tcp.upstream }}
+  loop: "{{ tailscale_services }}"
+  when: item.tcp is defined
+  register: tcp_result
+  changed_when: "'already serving' not in tcp_result.stderr | default('')"
+  failed_when: false