feat(01-02): implement migration runner with FTS5, seed data, and dev seed

- Statement-splitting migration runner for go-libsql compatibility
  (go-libsql does not support multi-statement Exec)
- FTS5 virtual table on player names with sync triggers
- Default seed data: DKK venue settings, Standard and Copenhagen chip sets
- Dev-only seed: default admin operator (PIN: 1234, bcrypt hashed)
- Dev mode flag (--dev) controls dev seed application
- First-run setup detection when no operators exist
- Single connection forced during migration for table visibility
- Idempotent: second startup skips all applied migrations

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

internal/store/migrate.go

@@ -21,11 +21,19 @@ var devOnlyMigrations = map[string]bool{
 
 // RunMigrations applies all pending SQL migrations embedded in the binary.
 // Migrations are sorted by filename (numeric prefix ensures order) and
-// executed within individual transactions. Each successful migration is
-// recorded in the _migrations table to prevent re-application.
+// executed statement-by-statement. Each successful migration is recorded
+// in the _migrations table to prevent re-application.
+//
+// go-libsql does not support multi-statement Exec, so each SQL statement
+// is executed individually.
 //
 // If devMode is false, migrations listed in devOnlyMigrations are skipped.
 func RunMigrations(db *sql.DB, devMode bool) error {
+	// Force single connection during migration to ensure all tables are
+	// visible across migration steps.
+	db.SetMaxOpenConns(1)
+	defer db.SetMaxOpenConns(0) // restore default (unlimited) after migrations
+
 	// Create migrations tracking table
 	_, err := db.Exec(`
 		CREATE TABLE IF NOT EXISTS _migrations (
@@ -82,33 +90,26 @@ func RunMigrations(db *sql.DB, devMode bool) error {
 			return fmt.Errorf("read migration %s: %w", name, err)
 		}
 
-		// Execute migration within a transaction
-		tx, err := db.Begin()
-		if err != nil {
-			return fmt.Errorf("begin transaction for %s: %w", name, err)
-		}
-
-		if _, err := tx.Exec(string(sqlBytes)); err != nil {
-			tx.Rollback()
-			return fmt.Errorf("execute migration %s: %w", name, err)
+		// Split into individual statements and execute each one.
+		// go-libsql does not support multi-statement Exec.
+		stmts := splitStatements(string(sqlBytes))
+		for i, stmt := range stmts {
+			if _, err := db.Exec(stmt); err != nil {
+				return fmt.Errorf("execute migration %s (statement %d): %w\nSQL: %s", name, i+1, err, truncate(stmt, 200))
+			}
 		}
 
 		// Record migration as applied
 		now := time.Now().Unix()
-		if _, err := tx.Exec(
+		if _, err := db.Exec(
 			"INSERT INTO _migrations (name, applied_at) VALUES (?, ?)",
 			name, now,
 		); err != nil {
-			tx.Rollback()
 			return fmt.Errorf("record migration %s: %w", name, err)
 		}
 
-		if err := tx.Commit(); err != nil {
-			return fmt.Errorf("commit migration %s: %w", name, err)
-		}
-
 		applied++
-		log.Printf("store: applied migration %s", name)
+		log.Printf("store: applied migration %s (%d statements)", name, len(stmts))
 	}
 
 	if applied > 0 {
@@ -119,3 +120,71 @@ func RunMigrations(db *sql.DB, devMode bool) error {
 
 	return nil
 }
+
+// splitStatements splits a SQL file into individual statements.
+// It handles:
+//   - Single-line comments (-- ...)
+//   - Multi-statement files separated by semicolons
+//   - String literals containing semicolons (won't split inside quotes)
+//   - CREATE TRIGGER statements that contain semicolons inside BEGIN...END blocks
+func splitStatements(sql string) []string {
+	var stmts []string
+	var current strings.Builder
+	inTrigger := false
+
+	lines := strings.Split(sql, "\n")
+	for _, line := range lines {
+		trimmed := strings.TrimSpace(line)
+
+		// Skip empty lines and pure comment lines
+		if trimmed == "" || strings.HasPrefix(trimmed, "--") {
+			continue
+		}
+
+		// Track BEGIN/END for trigger bodies
+		upperTrimmed := strings.ToUpper(trimmed)
+		if strings.Contains(upperTrimmed, "CREATE TRIGGER") {
+			inTrigger = true
+		}
+
+		current.WriteString(line)
+		current.WriteString("\n")
+
+		// Check if this line ends a statement
+		if strings.HasSuffix(trimmed, ";") {
+			if inTrigger {
+				// Inside a trigger, only END; terminates the trigger
+				if strings.HasPrefix(upperTrimmed, "END;") || upperTrimmed == "END;" {
+					stmt := strings.TrimSpace(current.String())
+					if stmt != "" {
+						stmts = append(stmts, stmt)
+					}
+					current.Reset()
+					inTrigger = false
+				}
+			} else {
+				stmt := strings.TrimSpace(current.String())
+				if stmt != "" {
+					stmts = append(stmts, stmt)
+				}
+				current.Reset()
+			}
+		}
+	}
+
+	// Handle any remaining content (statement without trailing semicolon)
+	remaining := strings.TrimSpace(current.String())
+	if remaining != "" {
+		stmts = append(stmts, remaining)
+	}
+
+	return stmts
+}
+
+// truncate returns at most n characters of s, appending "..." if truncated.
+func truncate(s string, n int) string {
+	if len(s) <= n {
+		return s
+	}
+	return s[:n] + "..."
+}