feat: docker-compose stacks with Forge-themed UI

Adds a new Stacks feature: upload/edit docker-compose YAML,
deploy as atomic units, browse revisions, roll back, and
stream logs. Backend in internal/stack + internal/api/stacks.go,
persistent storage in internal/store/stacks.go.

Stacks pages (list, new, detail) use a modern Forge aesthetic —
Instrument Serif display type, JetBrains Mono for meta/code,
indigo ember accents, dot-grid hero, registration marks on
hover, terminal panel for logs. Palette is sourced from the
app's existing design tokens so the feature remains consistent
with the rest of Tinyforge.

Fonts self-hosted via @fontsource/instrument-serif and
@fontsource/jetbrains-mono to satisfy the strict CSP.

internal/store/store.go

@@ -130,6 +130,48 @@ func (s *Store) runMigrations() error {
 		`ALTER TABLE static_sites ADD COLUMN storage_limit_mb INTEGER NOT NULL DEFAULT 0`,
 	}
 
+	// Additive stack tables (2026-04-16). Created here rather than in the
+	// schema constant so older databases pick them up on restart.
+	stackTables := []string{
+		`CREATE TABLE IF NOT EXISTS stacks (
+			id                   TEXT PRIMARY KEY,
+			name                 TEXT NOT NULL UNIQUE,
+			description          TEXT NOT NULL DEFAULT '',
+			compose_project_name TEXT NOT NULL UNIQUE,
+			status               TEXT NOT NULL DEFAULT 'stopped',
+			error                TEXT NOT NULL DEFAULT '',
+			current_revision_id  TEXT NOT NULL DEFAULT '',
+			created_at           TEXT NOT NULL DEFAULT (datetime('now')),
+			updated_at           TEXT NOT NULL DEFAULT (datetime('now'))
+		)`,
+		`CREATE TABLE IF NOT EXISTS stack_revisions (
+			id         TEXT PRIMARY KEY,
+			stack_id   TEXT NOT NULL REFERENCES stacks(id) ON DELETE CASCADE,
+			revision   INTEGER NOT NULL,
+			yaml       TEXT NOT NULL,
+			author     TEXT NOT NULL DEFAULT '',
+			deploy_id  TEXT NOT NULL DEFAULT '',
+			status     TEXT NOT NULL DEFAULT 'pending',
+			created_at TEXT NOT NULL DEFAULT (datetime('now')),
+			UNIQUE(stack_id, revision)
+		)`,
+		`CREATE TABLE IF NOT EXISTS stack_deploys (
+			id          TEXT PRIMARY KEY,
+			stack_id    TEXT NOT NULL REFERENCES stacks(id) ON DELETE CASCADE,
+			revision_id TEXT NOT NULL DEFAULT '',
+			status      TEXT NOT NULL DEFAULT 'pending',
+			log         TEXT NOT NULL DEFAULT '',
+			error       TEXT NOT NULL DEFAULT '',
+			started_at  TEXT NOT NULL DEFAULT (datetime('now')),
+			finished_at TEXT NOT NULL DEFAULT ''
+		)`,
+	}
+	for _, t := range stackTables {
+		if _, err := s.db.Exec(t); err != nil {
+			return fmt.Errorf("create stack table: %w", err)
+		}
+	}
+
 	for _, m := range migrations {
 		// Ignore errors from already-applied migrations (duplicate column).
 		_, _ = s.db.Exec(m)
@@ -150,6 +192,8 @@ func (s *Store) runMigrations() error {
 		`CREATE INDEX IF NOT EXISTS idx_event_log_created_at ON event_log(created_at)`,
 		`CREATE INDEX IF NOT EXISTS idx_dns_records_consumer ON dns_records(consumer_type, consumer_id)`,
 		`CREATE INDEX IF NOT EXISTS idx_static_site_secrets_site_id ON static_site_secrets(site_id)`,
+		`CREATE INDEX IF NOT EXISTS idx_stack_revisions_stack_id ON stack_revisions(stack_id)`,
+		`CREATE INDEX IF NOT EXISTS idx_stack_deploys_stack_id ON stack_deploys(stack_id)`,
 	}
 	for _, idx := range indexes {
 		if _, err := s.db.Exec(idx); err != nil {