Migrate devpi from minikube to indri (launchd) (#341)

## Summary

Devpi was crash-looping under memory pressure on the minikube StatefulSet, breaking the Python toolchain across the repo (`mise run docs-mikado`, `prek`, every `uv pip install`). It moves to indri as a native LaunchAgent.

## What changed

- **New ansible role** `ansible/roles/devpi/`: installs `devpi-server` + `devpi-web` into a uv-managed venv, initializes the server-dir on first run via 1Password root password, runs as a LaunchAgent (`mcquack.eblume.devpi`) bound to `127.0.0.1:3141`. Bootstraps from upstream PyPI (so devpi can install itself on a fresh box).
- **Caddy**: `pypi.ops.eblu.me` now proxies to `http://localhost:3141`.
- **Playbook**: `indri.yml` gains pre_tasks for the root password and the new role.
- **service-versions.yaml**: devpi flipped from `type: argocd` to `type: ansible`.
- **ArgoCD**: removed `apps/devpi.yaml` and `manifests/devpi/`. The in-cluster Application, namespace, and PVC have been deleted.
- **Docs**: new how-to `docs/how-to/operations/devpi-on-indri.md`; `restart-indri.md` lists devpi in the LaunchAgent stop list.

## Already deployed (live on indri)

- Service running: `launchctl list mcquack.eblume.devpi` → PID 53888
- `curl https://pypi.ops.eblu.me/+api` returns 200 ✅
- `mise run docs-mikado` works again ✅
- 1.0G of cached PyPI data was migrated from the PVC to `~erichblume/devpi/server-dir/`
- Minikube namespace and PVC fully reclaimed

## Test plan

- [ ] `mise run services-check` (after merge)
- [ ] CI workflows that use devpi succeed
- [ ] No regressions in tools that depend on `pypi.ops.eblu.me` (prek, uv-script tasks, dagger pipelines)

## Context

This is the C1 prelude to a planned C2 chain (`mikado/retire-minikube-indri`) to retire minikube on indri entirely. Doing devpi as a standalone C1 was the right call because (a) it was urgent — it was breaking the toolchain — and (b) it shakes out the migration recipe before we commit to a multi-leaf chain.

Reviewed-on: #341

ansible/playbooks/indri.yml

@@ -212,6 +212,23 @@
       no_log: true
       tags: [forgejo_metrics]
 
+    # Devpi root password (PyPI mirror admin)
+    - name: Fetch devpi root password
+      ansible.builtin.command:
+        cmd: op read "op://vg6xf6vvfmoh5hqjjhlhbeoaie/kyhzfifryqnuk7jeyibmmjvxxm/add more/root password"
+      delegate_to: localhost
+      register: _devpi_root_password
+      changed_when: false
+      no_log: true
+      check_mode: false
+      tags: [devpi]
+
+    - name: Set devpi root password fact
+      ansible.builtin.set_fact:
+        devpi_root_password: "{{ _devpi_root_password.stdout }}"
+      no_log: true
+      tags: [devpi]
+
   roles:
     - role: alloy
       tags: alloy
@@ -227,6 +244,8 @@
       tags: zot
     - role: zot_metrics
       tags: zot_metrics
+    - role: devpi
+      tags: devpi
     - role: minikube
       tags: minikube
     - role: minikube_metrics