[Developer] #204 Phase 1 MVP — Flutter app skeleton complete

- Drift 21 tables (8 catalog + 11 user + habit_dose_variants + meta_kv)
  with R1~R10 CHECK constraints and 19 indexes
- 8 hand-crafted seed JSON catalogs in app/assets/seed/
  (refs 84, protocols 34, methodologies 21, frame_patterns 30,
   reward_menu_items 30, break_protocols 8, common_frames 5, diet_patterns 5)
- 6 domain functions: recommend_variant, compute_streak,
  validate_frame_level, active_habit_quota, weekly_minimum_ratio,
  seed_importer (transactional, idempotent)
- 4 vertical-slice Riverpod screens: HabitList, HabitCreate, CheckIn, Streak
- 31 unit tests passing; flutter analyze clean
- OQ-5 streak semantics: missing entry ≠ explicit blank
  (missing = end of history; only TrackerValue.blank triggers Never-miss-twice)

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

.gitignore

@@ -33,3 +33,14 @@ target/
 # --- sibling repos (managed separately) ---
 # nutrition/은 별도 Gitea repo (joungmin/nutrition). life-helper와 sibling 관계.
 nutrition/
+
+# --- intermediate working dirs ---
+# seed-staging/은 시드 JSON 작성 작업 공간. 정본은 app/assets/seed/.
+seed-staging/
+
+# --- flutter build artifacts (under app/) ---
+app/.dart_tool/
+app/build/
+app/.flutter-plugins
+app/.flutter-plugins-dependencies
+app/.idea/