refactor: 合并 biz_support_unit/biz_execution_unit/biz_service_org 为 biz_org, 删除 2 张孤儿表, 改 biz_person.work_unit → org_id FK

主要改动:
- SQL: biz_support_unit → biz_org, 加 org_type, 加 business_nature; 删 biz_execution_unit, biz_service_org
- SQL: biz_project.support_unit_id/name + service_org_id/name → org_id/name/type
- SQL: biz_meeting.support_unit_name → org_name
- SQL: biz_person.work_unit → org_id (FK)
- 后端: 新 BizOrg entity/mapper/service/controller
- 后端: BizProject/BizMeeting 字段重命名
- 后端: 删 12 个 BizSupportUnit/BizExecutionUnit/BizServiceOrg Java 文件
- 后端: BizPersonImportVO.workUnit → orgName (导入时查 biz_org 取 org_id)
- 后端: BizAuthController.registerExecutor 完整实现 (原 registerSupplier stub)
- 前端: 新 admin/Orgs.vue + manager/Orgs.vue (原 SupportUnits)
- 前端: RegisterExecutor.vue (原 RegisterSupplier, 单页 2 步)
- 前端: sponsor/executor/manager 多个文件 workUnit → orgId/orgName 重命名
- 前端: 统一 supplier → executor, 业务命名 sponsor(赞助方) / executor(执行方=供应商)
- 前端: 全工程 execution → executor (company type / role / person unit_type)

.gitignore

@@ -0,0 +1,86 @@
+# ===== Java / Maven =====
+target/
+build/
+*.class
+*.jar
+*.war
+hs_err_pid*.log
+replay_pid*.log
+.mvn/
+mvnw
+mvnw.cmd
+
+# ===== Node / Vue =====
+node_modules/
+dist/
+.cache/
+.vite/
+*.local
+.npm
+.yarn
+
+# ===== IDE =====
+.idea/
+.vscode/
+*.iml
+*.iws
+*.ipr
+.project
+.classpath
+.settings/
+.factorypath
+
+# ===== OS =====
+.DS_Store
+Thumbs.db
+desktop.ini
+$RECYCLE.BIN/
+
+# ===== Logs =====
+logs/
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+pnpm-debug.log*
+
+# ===== Env =====
+.env
+.env.local
+.env.*.local
+
+# ===== Build outputs =====
+out/
+bin/
+*.exe
+*.dll
+*.so
+*.dylib
+
+# ===== Misc =====
+*.bak
+*.tmp
+*.swp
+*.swo
+*~
+.gradle/
+*.iml
+
+# ===== Session / planning 内部笔记 (不进版本库) =====
+.claude/
+.hermes/
+.planning/
+findings.md
+progress.md
+task_plan.md
+entity-config.json
+
+# ===== 大体积 / 二进制 / 备份 (不进版本库) =====
+RuoYi-Vue-master.zip
+apache-maven-3.9.16/
+apache-maven-3.9.16-bin.zip
+ry0808_mysql_dump.sql
+ry8080/
+ry8080.zip
+ry-console/
+ry-vue2/  # 旧 vue 控制台