docs(database): 规范脚本顺序并补全字段注释

script/sql/3.rag_store.sql

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+DROP TABLE IF EXISTS rag_store;
+
+CREATE TABLE rag_store (
+    id BIGSERIAL PRIMARY KEY,
+    store_code VARCHAR(100) NOT NULL,
+    store_name VARCHAR(200) NOT NULL,
+    description VARCHAR(1000) DEFAULT '',
+    status VARCHAR(50) NOT NULL DEFAULT 'ENABLED',
+    version INTEGER NOT NULL DEFAULT 1,
+    create_time TIMESTAMP,
+    update_time TIMESTAMP,
+    remark VARCHAR(500) DEFAULT '',
+    create_by VARCHAR(64),
+    update_by VARCHAR(64),
+    CONSTRAINT uk_rag_store_code UNIQUE (store_code)
+);
+
+CREATE INDEX idx_rag_store_status ON rag_store (status);
+CREATE INDEX idx_rag_store_create_time ON rag_store (create_time);
+
+COMMENT ON TABLE rag_store IS 'RAG知识库主表';
+COMMENT ON COLUMN rag_store.id IS 'ID';
+COMMENT ON COLUMN rag_store.store_code IS '知识库编码';
+COMMENT ON COLUMN rag_store.store_name IS '知识库名称';
+COMMENT ON COLUMN rag_store.description IS '知识库描述';
+COMMENT ON COLUMN rag_store.status IS '状态';
+COMMENT ON COLUMN rag_store.version IS '版本';
+COMMENT ON COLUMN rag_store.create_time IS '创建时间';
+COMMENT ON COLUMN rag_store.update_time IS '更新时间';
+COMMENT ON COLUMN rag_store.remark IS '备注';
+COMMENT ON COLUMN rag_store.create_by IS '创建者';
+COMMENT ON COLUMN rag_store.update_by IS '更新者';