Add the SERVALA_SSA_WRITES flag (default off). When enabled, create_instance
and update_spec write to Kubernetes via server-side apply with per-concern
field managers instead of a single merge patch, matching the managers used by
the sync patcher so ownership stays consistent across create, update and sync.

_split_spec_by_manager assigns each spec field to exactly one manager (user-spec
excludes compute/hardcoded-owned paths). Writes use force=True to assert the
portal's declared state and lazily migrate existing objects' field ownership
from Update to Apply on their next edit. create_instance bootstraps the full
schema-complete spec under the user-spec manager, then carves out per-manager
ownership with forced slice applies. With the flag off, the legacy merge-patch
and create verbs are used unchanged.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

frontend: add staff instance sync UI and audit log

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Details

fec271fae4

Add a staff-only /staff/sync/ tool that previews configuration drift between
the portal and live Kubernetes resources as a classic diff, then applies
selected fixes via the server-side-apply sync patcher. The flow is scope
picker -> drift report -> dry-run confirmation (surfacing SSA conflicts with
per-field force toggles) -> apply, with selections signed via Django's signer
to prevent tampering and re-scanned before apply to skip fields that drifted
again. Applies are capped per submission and gated by a new core.sync_instances
rules permission (staff by default, separately revocable).

Every applied/skipped/failed/stale field is recorded in a new
InstanceSyncAuditLog model.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Tests / test (push) Successful in 1m0s

Details

This pull request has changes conflicting with the target branch.

src/servala/core/management/commands/sync_instances.py
src/servala/core/models/service.py
src/servala/frontend/views/__init__.py
src/servala/static/css/servala.css

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Merge pull request 'WIP: Managed K8s with SSA and Sync UI' (#522) from k8s-ssa into main

Merge commit body

Reviewed-on: https://servala.app.codey.ch/servala/servala-portal/pulls/522

Merge pull request 'WIP: Managed K8s with SSA and Sync UI' (#522) from k8s-ssa into main

Reviewed-on: https://servala.app.codey.ch/servala/servala-portal/pulls/522

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