Add PostgreSQL and Miniflux services to tailnet (#16)

## Summary
- Add PostgreSQL 18 as a new service at `pg.tail8d86e.ts.net:5432`
- Add Miniflux RSS/Atom feed reader at `feed.tail8d86e.ts.net`
- Both services managed via homebrew/brew services
- Pulumi ACL tags added (tag:pg, tag:feed)
- Alloy log collection configured for both services
- Zettelkasten documentation updated

## Manual Setup Required

Before running ansible, the following steps are needed on indri:

### 1. Apply Pulumi tags
```bash
mise run tailnet-up
```
Then apply tags to indri in Tailscale admin console.

### 2. Create 1Password entries
- miniflux PostgreSQL user password
- miniflux admin password (for first run)

### 3. Set PostgreSQL user password (after ansible installs postgres)
```bash
ssh indri '/opt/homebrew/opt/postgresql@18/bin/psql -c "ALTER USER miniflux PASSWORD '\''your-password'\'';"'
```

### 4. Create password files on indri
```bash
ssh indri 'echo "your-db-password" > ~/.miniflux-db-password && chmod 600 ~/.miniflux-db-password'
ssh indri 'echo "your-admin-password" > ~/.miniflux-admin-password && chmod 600 ~/.miniflux-admin-password'
```

### 5. Create ~/.pgpass for borgmatic
```bash
ssh indri 'echo "localhost:5432:miniflux:miniflux:YOUR_PASSWORD" > ~/.pgpass && chmod 600 ~/.pgpass'
```

### 6. Run ansible with first-run admin creation
```bash
mise run provision-indri -- -e miniflux_create_admin=1
```

### 7. Update borgmatic config
Add to `~/.config/borgmatic/config.yaml` on indri:
```yaml
postgresql_databases:
    - name: miniflux
      hostname: localhost
      port: 5432
      username: miniflux
```

### 8. Cleanup after first run
```bash
ssh indri 'rm ~/.miniflux-admin-password'
```

## Test plan
- [ ] Run `mise run tailnet-up` and verify Pulumi changes
- [ ] Apply tags to indri in Tailscale admin
- [ ] Run `mise run provision-indri -- --check --diff` for dry run
- [ ] Run `mise run provision-indri -- -e miniflux_create_admin=1`
- [ ] Approve services in Tailscale admin
- [ ] Verify PostgreSQL: `ssh indri '/opt/homebrew/opt/postgresql@18/bin/pg_isready'`
- [ ] Verify Miniflux: `curl https://feed.tail8d86e.ts.net/healthcheck`
- [ ] Run `mise run indri-services-check`

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Reviewed-on: https://forge.tail8d86e.ts.net/eblume/blumeops/pulls/16

ansible/roles/alloy/tasks/main.yml

@@ -25,12 +25,46 @@
     state: directory
     mode: '0755'
 
+# === Fetch PostgreSQL password from 1Password ===
+# Skipped when running full playbook (pre_tasks sets it)
+# but runs when using --tags alloy
+
+- name: Fetch PostgreSQL metrics password from 1Password
+  ansible.builtin.command:
+    cmd: op --vault {{ alloy_op_vault }} item get {{ alloy_op_postgres_item }} --fields {{ alloy_op_postgres_field }} --reveal
+  delegate_to: localhost
+  register: alloy_postgres_password_result
+  changed_when: false
+  no_log: true
+  when:
+    - alloy_collect_postgres | default(false)
+    - alloy_postgres_password is not defined
+
+- name: Set PostgreSQL password fact
+  ansible.builtin.set_fact:
+    alloy_postgres_password: "{{ alloy_postgres_password_result.stdout }}"
+  no_log: true
+  when:
+    - alloy_collect_postgres | default(false)
+    - alloy_postgres_password is not defined
+
+# === Deploy configuration ===
+
+- name: Deploy PostgreSQL custom queries config
+  ansible.builtin.template:
+    src: postgres_queries.yaml.j2
+    dest: "{{ alloy_config_dir }}/postgres_queries.yaml"
+    mode: '0600'
+  notify: restart alloy
+  when: alloy_collect_postgres | default(false)
+
 - name: Deploy alloy configuration
   ansible.builtin.template:
     src: config.alloy.j2
     dest: "{{ alloy_config_dir }}/config.alloy"
-    mode: '0644'
+    mode: '0600'
   notify: restart alloy
+  no_log: true
 
 - name: Ensure alloy service is started
   ansible.builtin.command: brew services start grafana-alloy