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ragflow/rag
qinling0210 c5ff2bced5 Refine agentic RAG phase logging (#18228)
### Summary

Refine agentic RAG phase logging

example:
```
2026-08-13 17:25:06,733 INFO     2434554 [Agentic RAG] LLM usage by phase:                                                             phase            llm_calls prompt_tok   output_tok  total_tok    time(s)
  formalize              1        389          151        540        1.7
  route                  1        287          234        521        2.7
  planner                1      11857          832      12689        6.8
  orchestrator round 1       0          0            0          0      171.5
    claim_research (2)       8      82519        23146     105665      131.0
    sufficiency            2      10122         1709      11831       15.0
    grounded               1       5846         3232       9078       24.7
  finalize               2       9945         2228      12173       19.9
  total: 16 LLM calls, 152497 tokens
```
2026-08-13 20:15:24 +08:00
..
2025-12-31 17:18:30 +08:00