feat(seed): add --ci flag for bare-minimum E2E seed (v1.0.8 C4)

Prep for the upcoming E2E Playwright CI workflow. The full seed (1200
users, 5000 tracks, 100k play events, 10k messages, etc.) takes ~60s
and produces a lot of fixture data the suite never reads. A CI run
just needs the 5 test accounts the auth fixture logs in as
(admin/artist/user/mod/new) plus a small content set so player /
playlist tests have something to render.

New flag:
  go run ./cmd/tools/seed --ci

CIConfig (cmd/tools/seed/config.go):
- TotalUsers = 5 (== len(testAccounts), so SeedUsers' "remaining"
  branch is a no-op — only the 5 hardcoded accounts get inserted).
- Tracks = 10, Playlists = 3 (covers player + playlist suites).
- Albums = 0, all social/chat/live/marketplace/analytics/etc. = 0.

main.go gates the heavy seeders (Social / Chat / Live / Marketplace /
Analytics / Content / Moderation / Notifications / Misc) behind
`if !cfg.CIMode`, prints a one-line "skipping ..." banner so the run
log makes the choice obvious. The Users / Tracks / Playlists path is
unchanged — same code, same validation pass at the end.

Time: ~5s in CI mode (bcrypt cost 12 × 5 + a handful of bulk inserts)
vs the ~60s minimal mode and ~5min full mode, measured locally
against a tmpfs Postgres.

Validate() and the SUMMARY printout work unchanged — empty tables
just show "0 rows", and the orphan-FK checks remain useful (and pass
trivially when the heavy seeders are skipped).

modeName() returns "CI" so the boot banner reflects the choice.
go build ./... clean. Help output:

  -ci          Bare-minimum seed for E2E CI (...)
  -minimal     Use reduced volumes (50 users, 200 tracks) for fast dev

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

veza-backend-api/cmd/tools/seed/config.go

@@ -4,6 +4,13 @@ import "flag"
 
 // Config holds all seed volume parameters.
 type Config struct {
+	// CIMode: when true, main.go only runs SeedUsers / SeedTracks /
+	// SeedPlaylists and skips Chat/Live/Marketplace/Analytics/Content/
+	// Moderation/Notifications/Misc. Used by E2E CI to avoid the ~60s
+	// full seed when all the suite needs is the 5 test accounts and a
+	// handful of tracks/playlists.
+	CIMode bool
+
 	// Users
 	TotalUsers  int
 	NormalUsers int
@@ -163,10 +170,43 @@ func MinimalConfig() Config {
 	}
 }
 
+// CIConfig returns the bare-minimum configuration for E2E CI:
+// just the 5 hardcoded test accounts (admin/artist/user/mod/new) plus
+// a small fixture set of tracks and playlists. main.go skips the
+// non-essential seeders when CIMode is true.
+func CIConfig() Config {
+	return Config{
+		CIMode: true,
+
+		// 5 test accounts only — TotalUsers == len(testAccounts) so
+		// SeedUsers' "remaining" branch is a no-op.
+		TotalUsers:  5,
+		NormalUsers: 2,
+		Artists:     1,
+		Labels:      0,
+		Moderators:  1,
+		Admins:      1,
+
+		// Small fixture set so player / playlist tests have content.
+		Tracks:            10,
+		Albums:            0,
+		Playlists:         3,
+		PlaylistMinTracks: 1,
+		PlaylistMaxTracks: 3,
+
+		// Everything else stays at zero — corresponding seeders are
+		// either skipped via CIMode or run as no-ops on zero counts.
+	}
+}
+
 // ParseFlags parses CLI flags and returns the appropriate config.
 func ParseFlags() Config {
 	minimal := flag.Bool("minimal", false, "Use reduced volumes (50 users, 200 tracks) for fast dev")
+	ci := flag.Bool("ci", false, "Bare-minimum seed for E2E CI (5 test accounts + 10 tracks + 3 playlists, skips chat/live/marketplace/analytics)")
 	flag.Parse()
+	if *ci {
+		return CIConfig()
+	}
 	if *minimal {
 		return MinimalConfig()
 	}

veza-backend-api/cmd/tools/seed/main.go

@@ -72,6 +72,12 @@ func main() {
 		log.Fatalf("seed playlists: %v", err)
 	}
 
+	// CI mode stops here — the E2E suite only needs the test accounts
+	// + a fixture set of tracks/playlists. Skipping the remaining
+	// seeders shaves ~50s off the typical CI seed time.
+	if cfg.CIMode {
+		fmt.Println("\n═══ CI MODE: skipping social/chat/live/marketplace/analytics/content/moderation/notifications/misc ═══")
+	} else {
 		// Level 2: Social (depends on users, tracks)
 		if err := SeedSocial(db, cfg, users, tracks); err != nil {
 			log.Fatalf("seed social: %v", err)
@@ -118,6 +124,7 @@ func main() {
 		if err := SeedMisc(db, cfg, users); err != nil {
 			log.Fatalf("seed misc: %v", err)
 		}
+	}
 
 	// ── VALIDATION ───────────────────────────────────────────────────────────
 	fmt.Println("\n═══ VALIDATION ═══")
@@ -170,6 +177,9 @@ func main() {
 }
 
 func modeName(cfg Config) string {
+	if cfg.CIMode {
+		return "CI"
+	}
 	if cfg.TotalUsers <= 100 {
 		return "MINIMAL"
 	}