feat: 人设模板系统、节点调度标签、pydantic-settings收敛、错误处理增强

新增persona_template表和CRUD API，BaseIndividualModel增加node_affinity和template_origin_id字段，
WorkerCluster支持多集群Ray资源调度，环境变量收敛到pydantic-settings统一校验，
数据库异常转换为结构化BusinessError/RetryableError，系统节点支持custom_system_prompt。

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

kilostar/core/individual/consciousness_node/consciousness_node.py

@@ -48,8 +48,9 @@ class ConsciousnessNode:
         tools_list: list[str] = None,
         toolsets=None,
         locale: str | None = None,
+        custom_system_prompt: str | None = None,
     ) -> None:
-        system_prompt: str = agent_prompt("consciousness_node", locale=locale)
+        system_prompt: str = agent_prompt("consciousness_node", locale=locale, custom_system_prompt=custom_system_prompt)
         output_type = Union[ForregulatoryNode, ForWorkflow, ForWorkflowEngine]
         from kilostar.utils.get_tool import load_tools_from_list
         from kilostar.core.global_state_machine.gsm_snapshot import fetch_snapshot