feat(agent): 接入Agent调试与RAG召回链路

script/sql/agent_definition.sql

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+DROP TABLE IF EXISTS agent_definition;
+
+CREATE TABLE agent_definition (
+    id BIGSERIAL PRIMARY KEY,
+    agent_code VARCHAR(100) NOT NULL,
+    agent_name VARCHAR(200) NOT NULL,
+    system_prompt TEXT,
+    store_id BIGINT NOT NULL,
+    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_agent_definition_code UNIQUE (agent_code),
+    CONSTRAINT fk_agent_definition_store_id FOREIGN KEY (store_id) REFERENCES rag_store (id)
+);
+
+CREATE INDEX idx_agent_definition_store_id ON agent_definition (store_id);
+CREATE INDEX idx_agent_definition_status ON agent_definition (status);
+
+COMMENT ON TABLE agent_definition IS 'Agent定义表';
+COMMENT ON COLUMN agent_definition.id IS 'ID';
+COMMENT ON COLUMN agent_definition.agent_code IS 'Agent编码';
+COMMENT ON COLUMN agent_definition.agent_name IS 'Agent名称';
+COMMENT ON COLUMN agent_definition.system_prompt IS '系统提示词';
+COMMENT ON COLUMN agent_definition.store_id IS '绑定知识库ID';
+COMMENT ON COLUMN agent_definition.status IS '状态';
+COMMENT ON COLUMN agent_definition.version IS '版本';
+COMMENT ON COLUMN agent_definition.create_time IS '创建时间';
+COMMENT ON COLUMN agent_definition.update_time IS '更新时间';
+COMMENT ON COLUMN agent_definition.remark IS '备注';
+COMMENT ON COLUMN agent_definition.create_by IS '创建者';
+COMMENT ON COLUMN agent_definition.update_by IS '更新者';