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/borgmatic/tasks/main.yml

@@ -1,6 +1,18 @@
 ---
 # Note: borgmatic is installed via mise (pipx), not managed here.
-# This role manages only the scheduled LaunchAgent.
+# This role manages the config file and scheduled LaunchAgent.
+
+- name: Ensure borgmatic config directory exists
+  ansible.builtin.file:
+    path: "{{ borgmatic_config_dir }}"
+    state: directory
+    mode: '0700'
+
+- name: Deploy borgmatic configuration
+  ansible.builtin.template:
+    src: config.yaml.j2
+    dest: "{{ borgmatic_config }}"
+    mode: '0600'
 
 - name: Deploy borgmatic LaunchAgent plist
   ansible.builtin.template: