feat: activity feed — enriched audit events + global/project timelines (#45)

* feat(branding): white-label — public /branding, admin write, shell theming

app_settings branding.* keys (product name, logo/favicon URLs, accent
color, docs/support links). Public GET /branding so login and shell
theme pre-auth; admin writes via PUT /settings.

useBranding() applies document.title, accent CSS var and favicon;
BrandWordmark replaces hardcoded wordmarks; admin Platform settings
gain a Branding form. MCP containr_branding_get + settings_update.

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Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

* feat(invites): team invite links — admin create/revoke, public accept

Admins mint single-use invite links (sha256-hashed token at rest,
optional email binding, configurable TTL). Public endpoints let the
accept page validate the link and register — working even while
public signup is disabled.

- migration + sqlc queries/model for user_invites
- POST /admin/invites (returns one-time token+url), GET list, DELETE revoke
- GET /auth/invites/:token public validation, POST /auth/accept-invite
- CLI containr invites list|create|revoke; MCP invites tools
- /auth/accept-invite page (expired/used/invalid states, bound-email lock)
- Admin page Team invites section: create, copy link, revoke
- OpenAPI + generated types + CLI guide

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Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

* feat(admin): impersonate user — 15-min token, audit-logged

POST /admin/users/:id/impersonate mints a short-lived bearer token
(impersonated_by claim) for support/debugging. Admin accounts cannot
be impersonated; every mint is audit-logged with actor + target.

- CLI: containr admin impersonate <user-id> (works via CONTAINR_TOKEN)
- MCP: containr_admin_impersonate
- Admin UI: per-user Impersonate action → token modal with usage hint
- OpenAPI + generated types

Verified live: token resolves to target, admin target 403, audit row.

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Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

* feat(git): GitHub App manifest self-provisioning + app-level webhook

Admins create the instance GitHub App in-browser instead of hand-
setting GITHUB_APP_* env vars:

- POST /admin/git/github-app/manifest builds the manifest + URL;
  the frontend auto-submits it to github.com
- /git/github-app/callback page exchanges the code via
  POST /admin/git/github-app/convert; credentials persist in
  app_settings (precedence over env)
- GET /admin/git/github-app reports configured/source
- POST /api/git/github-app/webhook — single app-level push receiver,
  HMAC-verified, dispatches via extracted dispatchPushToServices
- install-url + installation-token paths resolve settings→env
- CLI: containr admin github-app status|manifest|convert; MCP tools
- Git providers UI shows "Set up GitHub App" for admins when
  unconfigured

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Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

* feat: activity feed — enriched audit events, global + per-project timelines

audit_logs gains severity/category/label columns derived from
resource+action at write time; legacy rows are classified on read and
backfilled at boot in batches.

- GET /activity: global feed scoped to the caller's visible projects
  (admins see all); severity/category/resource/project_id/since
  filters, page+limit
- GET /projects/:id/activity: timeline correlated to the project's
  services, deployments, databases and the project record; access
  mirrors project read rules
- Retention worker prunes rows older than AUDIT_RETENTION_DAYS
  (default 90, 0 disables), running once at boot then daily
- project.create/delete now audited so timelines aren't empty
- CLI `containr activity` with filter flags; MCP tools
  containr_activity_list + containr_project_activity
- Frontend: /activity page (severity chips, icon per category) under
  Operate nav; project workspace gains an Activity view tab
- OpenAPI + generated types + CLI docs

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---------

Co-authored-by: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

app/backend/internal/cli/commands/activity.go

@@ -0,0 +1,67 @@
+package commands
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/spf13/cobra"
+)
+
+var (
+	activitySeverity string
+	activityCategory string
+	activityResource string
+	activityProject  string
+	activityLimit    int
+)
+
+// ActivityCmd shows the enriched activity feed (audit events with
+// severity/category/label).
+var ActivityCmd = &cobra.Command{
+	Use:   "activity",
+	Short: "Activity feed — enriched audit events",
+	RunE: func(cmd *cobra.Command, args []string) error {
+		c, err := client()
+		if err != nil {
+			return err
+		}
+		params := []string{fmt.Sprintf("limit=%d", activityLimit)}
+		if activitySeverity != "" {
+			params = append(params, "severity="+activitySeverity)
+		}
+		if activityCategory != "" {
+			params = append(params, "category="+activityCategory)
+		}
+		if activityResource != "" {
+			params = append(params, "resource="+activityResource)
+		}
+		if activityProject != "" {
+			params = append(params, "project_id="+activityProject)
+		}
+		data, err := c.Do("GET", "/activity?"+strings.Join(params, "&"), nil)
+		if err != nil {
+			return err
+		}
+		items, err := unwrapList(data, "activity")
+		if err != nil {
+			return err
+		}
+		rows := make([][]string, 0, len(items))
+		for _, e := range items {
+			rows = append(rows, []string{
+				str(e, "severity"), str(e, "category"), str(e, "label"),
+				str(e, "user_email"), relTime(e, "created_at"),
+			})
+		}
+		printRows(data, []string{"SEVERITY", "CATEGORY", "EVENT", "ACTOR", "WHEN"}, rows)
+		return nil
+	},
+}
+
+func init() {
+	ActivityCmd.Flags().StringVar(&activitySeverity, "severity", "", "filter: info|success|warning|error")
+	ActivityCmd.Flags().StringVar(&activityCategory, "category", "", "filter by category")
+	ActivityCmd.Flags().StringVar(&activityResource, "resource", "", "filter by resource type")
+	ActivityCmd.Flags().StringVar(&activityProject, "project", "", "filter by project id")
+	ActivityCmd.Flags().IntVar(&activityLimit, "limit", 50, "max events")
+}