feat(129): order user notes module

CRUD notatek autorskich operatora per zamowienie z badge [N] na liscie
zamowien. Reuse istniejacej tabeli `order_notes` przez nowy
`note_type='user'` z `user_id` (FK->users SET NULL) i `author_name`
(snapshot). Sekcja `#notes` w "Wiadomosci i zalaczniki" w
`/orders/{id}` z inline edit form + delete przez
`OrderProAlerts.confirm`. Autoryzacja DB-level
(`WHERE user_id = :user_id`, rowCount=0 ⇒ 403) — bez admin override
(brak systemu rol w aplikacji).

- Migracja `20260514_000116_*.sql` (ADD COLUMN user_id + author_name +
  FK + indeks `idx_order_notes_type_order`); idempotentne z DDL
  no-op fallback.
- `OrderNotesService` (CRUD + walidacja body ≤ 2000 znakow); subquery
  `user_notes_count` w paginate; badge HTML w `toTableRow()`.
- 3 routy POST /orders/{id}/notes(/update|/delete).
- SCSS module `_order-notes.scss` + vanilla JS `order-notes.js`
  (inline edit toggle + delete confirm; idempotent guard).
- 9 kluczy i18n PL; PROJECT.md + ROADMAP.md + tech_changelog.md +
  db_schema.md zaktualizowane.

Follow-up: `php bin/migrate.php` + manualny smoke test (autor vs inny
user + badge na /orders/list).

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

database/migrations/20260514_000116_extend_order_notes_user_authored.sql

@@ -0,0 +1,57 @@
+-- Phase 129-01: extend order_notes o pola dla notatek autorskich (user-authored)
+-- Reuse istniejacej tabeli z nowym note_type='user', user_id (FK->users), author_name (snapshot).
+-- Idempotentna: guard przez information_schema; no-op po pierwszym uruchomieniu.
+-- Pattern z Key Decision 2026-05-10: migracje no-op zawsze jako DDL (ALTER TABLE COMMENT),
+-- nigdy SELECT 1 (PDO unbuffered + result set -> SQLSTATE 2014).
+
+-- 1) ADD COLUMN user_id
+SET @col_user_id := (
+  SELECT COUNT(*) FROM information_schema.COLUMNS
+  WHERE TABLE_SCHEMA = DATABASE()
+    AND TABLE_NAME = 'order_notes'
+    AND COLUMN_NAME = 'user_id'
+);
+SET @sql_user_id := IF(@col_user_id = 0,
+  'ALTER TABLE order_notes ADD COLUMN user_id INT UNSIGNED NULL AFTER note_type',
+  'ALTER TABLE order_notes COMMENT = ''phase-129 user_id no-op'''
+);
+PREPARE s1 FROM @sql_user_id; EXECUTE s1; DEALLOCATE PREPARE s1;
+
+-- 2) ADD COLUMN author_name
+SET @col_author_name := (
+  SELECT COUNT(*) FROM information_schema.COLUMNS
+  WHERE TABLE_SCHEMA = DATABASE()
+    AND TABLE_NAME = 'order_notes'
+    AND COLUMN_NAME = 'author_name'
+);
+SET @sql_author_name := IF(@col_author_name = 0,
+  'ALTER TABLE order_notes ADD COLUMN author_name VARCHAR(190) NULL AFTER user_id',
+  'ALTER TABLE order_notes COMMENT = ''phase-129 author_name no-op'''
+);
+PREPARE s2 FROM @sql_author_name; EXECUTE s2; DEALLOCATE PREPARE s2;
+
+-- 3) ADD FOREIGN KEY user_id -> users(id) ON DELETE SET NULL
+SET @fk_exists := (
+  SELECT COUNT(*) FROM information_schema.TABLE_CONSTRAINTS
+  WHERE TABLE_SCHEMA = DATABASE()
+    AND TABLE_NAME = 'order_notes'
+    AND CONSTRAINT_NAME = 'order_notes_user_fk'
+);
+SET @sql_fk := IF(@fk_exists = 0,
+  'ALTER TABLE order_notes ADD CONSTRAINT order_notes_user_fk FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE SET NULL ON UPDATE CASCADE',
+  'ALTER TABLE order_notes COMMENT = ''phase-129 fk no-op'''
+);
+PREPARE s3 FROM @sql_fk; EXECUTE s3; DEALLOCATE PREPARE s3;
+
+-- 4) ADD INDEX (note_type, order_id) — wspiera subquery user_notes_count i listUserNotes
+SET @idx_exists := (
+  SELECT COUNT(*) FROM information_schema.STATISTICS
+  WHERE TABLE_SCHEMA = DATABASE()
+    AND TABLE_NAME = 'order_notes'
+    AND INDEX_NAME = 'idx_order_notes_type_order'
+);
+SET @sql_idx := IF(@idx_exists = 0,
+  'ALTER TABLE order_notes ADD INDEX idx_order_notes_type_order (note_type, order_id)',
+  'ALTER TABLE order_notes COMMENT = ''phase-129 idx no-op'''
+);
+PREPARE s4 FROM @sql_idx; EXECUTE s4; DEALLOCATE PREPARE s4;