feat(aihr): add position qualification schema contract

docs/BRD_PRODUCTION_MIGRATION_RUNBOOK.md

@@ -39,9 +39,10 @@ mysql --default-character-set=utf8mb4 "$DB_NAME" < backend/script/sql/update/aih
 mysql --default-character-set=utf8mb4 "$DB_NAME" < backend/script/sql/update/aihr_20260714_sop_requester_identity_mysql8.sql
 mysql --default-character-set=utf8mb4 "$DB_NAME" < backend/script/sql/update/aihr_20260715_knowledge_feedback_mysql8.sql
 mysql --default-character-set=utf8mb4 "$DB_NAME" < backend/script/sql/update/aihr_20260714_org_hire_date_mysql8.sql
+mysql --default-character-set=utf8mb4 "$DB_NAME" < backend/script/sql/update/aihr_20260715_position_sop_qualification_mysql8.sql
 ```
 
-顺序原因：场景补充依赖三张场景/Rubric 基础表；五维迁移依赖场景和 Rubric；其余字段迁移依赖既有业务表但不写正式业务行。住宅 SOP 和 Prompt 迁移只补内置内容，不代表内容已完成业务复核。
+顺序原因：场景补充依赖三张场景/Rubric 基础表；五维迁移依赖场景和 Rubric；岗位/SOP/任务/资格迁移只补正式数据契约，不写业务行，也不代表岗位适用范围、任务规则或资格标准已经获得 HR 确认。住宅 SOP 和 Prompt 迁移只补内置内容，不代表内容已完成业务复核。
 
 ## 迁移后只读核验
 
@@ -55,7 +56,9 @@ WHERE table_schema = DATABASE()
     'aihr_practice_scenario', 'aihr_practice_rubric', 'aihr_practice_rubric_dimension',
     'aihr_practice_audio', 'aihr_practice_audio_upload', 'aihr_practice_calibration',
     'aihr_knowledge_gap', 'aihr_knowledge_answer_feedback',
-    'aihr_candidate_material', 'aihr_interview_result', 'aihr_candidate_employee_link'
+    'aihr_candidate_material', 'aihr_interview_result', 'aihr_candidate_employee_link',
+    'aihr_position_responsibility', 'aihr_sop_applicability',
+    'aihr_onboard_task', 'aihr_qualification_gate'
   )
 ORDER BY table_name;
 
@@ -70,6 +73,10 @@ WHERE table_schema = DATABASE()
     OR (table_name = 'aihr_org_snapshot' AND column_name = 'hire_date')
     OR (table_name = 'aihr_candidate_material' AND column_name IN ('reviewer', 'reviewed_time'))
     OR (table_name = 'aihr_interview_result' AND column_name IN ('questions_json', 'reviewed_score', 'review_status', 'reviewer', 'review_note', 'reviewed_time'))
+    OR (table_name = 'aihr_position_responsibility' AND column_name IN ('position_code', 'responsibility_text', 'sop_id', 'sop_code'))
+    OR (table_name = 'aihr_sop_applicability' AND column_name IN ('sop_id', 'sop_code', 'project_type', 'industry', 'org_scope'))
+    OR (table_name = 'aihr_onboard_task' AND column_name IN ('ext_party_id', 'position_code', 'task_type', 'status', 'assign_by'))
+    OR (table_name = 'aihr_qualification_gate' AND column_name IN ('ext_party_id', 'position_code', 'cert_id', 'passed', 'valid_thru'))
   )
 ORDER BY table_name, column_name;
 
@@ -79,7 +86,7 @@ WHERE tenant_id = '000000'
   AND code IN ('summary_card', 'sop_answer', 'mentor_rewrite', 'review_annotation', 'prep_card', 'supervision_image_analysis_maintenance');
 ```
 
-预期是三张场景/Rubric 表、三张证据表、两张知识治理表和三张候选人/面试表均存在，会话证据字段为 `8/8`，候选资料审核字段为 `2/2`，面试复核字段为 `6/6`，字段查询覆盖所有列，内置 Prompt 数量为 `6`。这只证明 schema/seed 迁移完成，不证明正式试点完成。
+预期是三张场景/Rubric 表、三张证据表、两张知识治理表、三张候选人/面试表和四张岗位/SOP/任务/资格契约表均存在，会话证据字段为 `8/8`，候选资料审核字段为 `2/2`，面试复核字段为 `6/6`，字段查询覆盖所有列，内置 Prompt 数量为 `6`。岗位/SOP/任务/资格表为空是允许的；这只证明 schema/seed 迁移完成，不证明正式岗位规则、资格 gating 或试点完成。
 
 ## 迁移后应用回归