feat(db): 创建 ai_knowledge_bases 表迁移

知识库 V2 第一张表：支持多类型知识库（规则/参考资料/临床指南/FAQ），
含意图关键词 JSONB、切片策略 JSONB、文档/切片计数器。

crates/erp-server/migration/src/lib.rs

@@ -172,6 +172,7 @@ mod m20260522_000162_seed_patient_miniprogram_permissions;
 mod m20260526_000163_points_rule_unique_event_type;
 mod m20260526_000164_ai_prompt_add_analysis_type;
 mod m20260526_000165_ai_prompt_fix_analysis_type;
+mod m20260526_000166_create_ai_knowledge_bases;
 
 pub struct Migrator;
 
@@ -351,6 +352,7 @@ impl MigratorTrait for Migrator {
             Box::new(m20260526_000163_points_rule_unique_event_type::Migration),
             Box::new(m20260526_000164_ai_prompt_add_analysis_type::Migration),
             Box::new(m20260526_000165_ai_prompt_fix_analysis_type::Migration),
+            Box::new(m20260526_000166_create_ai_knowledge_bases::Migration),
         ]
     }
 }

crates/erp-server/migration/src/m20260526_000166_create_ai_knowledge_bases.rs

@@ -0,0 +1,141 @@
+use sea_orm_migration::prelude::*;
+
+#[derive(DeriveMigrationName)]
+pub struct Migration;
+
+#[derive(Iden)]
+enum AiKnowledgeBases {
+    Table,
+    Id,
+    TenantId,
+    Name,
+    KbType,
+    Description,
+    Icon,
+    ChunkStrategy,
+    IntentKeywords,
+    EmbeddingModel,
+    IsEnabled,
+    DocumentCount,
+    ChunkCount,
+    CreatedAt,
+    UpdatedAt,
+    CreatedBy,
+    UpdatedBy,
+    DeletedAt,
+    VersionLock,
+}
+
+#[async_trait::async_trait]
+impl MigrationTrait for Migration {
+    async fn up(&self, manager: &SchemaManager) -> Result<(), DbErr> {
+        manager
+            .create_table(
+                Table::create()
+                    .table(AiKnowledgeBases::Table)
+                    .if_not_exists()
+                    .col(
+                        ColumnDef::new(AiKnowledgeBases::Id)
+                            .uuid()
+                            .not_null()
+                            .primary_key(),
+                    )
+                    .col(ColumnDef::new(AiKnowledgeBases::TenantId).uuid().not_null())
+                    .col(
+                        ColumnDef::new(AiKnowledgeBases::Name)
+                            .string_len(200)
+                            .not_null(),
+                    )
+                    .col(
+                        ColumnDef::new(AiKnowledgeBases::KbType)
+                            .string_len(50)
+                            .not_null(),
+                    )
+                    .col(ColumnDef::new(AiKnowledgeBases::Description).text())
+                    .col(ColumnDef::new(AiKnowledgeBases::Icon).string_len(50))
+                    .col(
+                        ColumnDef::new(AiKnowledgeBases::ChunkStrategy)
+                            .json_binary()
+                            .not_null()
+                            .default(Expr::cust("'{}'")),
+                    )
+                    .col(
+                        ColumnDef::new(AiKnowledgeBases::IntentKeywords)
+                            .json_binary()
+                            .not_null()
+                            .default(Expr::cust("'[]'")),
+                    )
+                    .col(ColumnDef::new(AiKnowledgeBases::EmbeddingModel).string_len(100))
+                    .col(
+                        ColumnDef::new(AiKnowledgeBases::IsEnabled)
+                            .boolean()
+                            .not_null()
+                            .default(true),
+                    )
+                    .col(
+                        ColumnDef::new(AiKnowledgeBases::DocumentCount)
+                            .integer()
+                            .not_null()
+                            .default(0),
+                    )
+                    .col(
+                        ColumnDef::new(AiKnowledgeBases::ChunkCount)
+                            .integer()
+                            .not_null()
+                            .default(0),
+                    )
+                    .col(
+                        ColumnDef::new(AiKnowledgeBases::CreatedAt)
+                            .timestamp_with_time_zone()
+                            .not_null()
+                            .default(Expr::current_timestamp()),
+                    )
+                    .col(
+                        ColumnDef::new(AiKnowledgeBases::UpdatedAt)
+                            .timestamp_with_time_zone()
+                            .not_null()
+                            .default(Expr::current_timestamp()),
+                    )
+                    .col(ColumnDef::new(AiKnowledgeBases::CreatedBy).uuid())
+                    .col(ColumnDef::new(AiKnowledgeBases::UpdatedBy).uuid())
+                    .col(ColumnDef::new(AiKnowledgeBases::DeletedAt).timestamp_with_time_zone())
+                    .col(
+                        ColumnDef::new(AiKnowledgeBases::VersionLock)
+                            .integer()
+                            .not_null()
+                            .default(1),
+                    )
+                    .to_owned(),
+            )
+            .await?;
+
+        manager
+            .create_index(
+                Index::create()
+                    .if_not_exists()
+                    .name("idx_kb_tenant")
+                    .table(AiKnowledgeBases::Table)
+                    .col(AiKnowledgeBases::TenantId)
+                    .to_owned(),
+            )
+            .await?;
+
+        manager
+            .create_index(
+                Index::create()
+                    .if_not_exists()
+                    .name("idx_kb_type")
+                    .table(AiKnowledgeBases::Table)
+                    .col(AiKnowledgeBases::TenantId)
+                    .col(AiKnowledgeBases::KbType)
+                    .to_owned(),
+            )
+            .await
+    }
+
+    async fn down(&self, manager: &SchemaManager) -> Result<(), DbErr> {
+        manager
+            .drop_table(Table::drop().table(AiKnowledgeBases::Table).to_owned())
+            .await
+    }
+}