Fix garbled Chinese log messages, bare except clauses, and unsafe empty-list access in EIS processing

[Copilot]

Repository audit found ~20 corrupted Chinese strings in get_ir_from_eis(), unsafe bare except: clauses across 4 files, and a potential crash when _filter_outliers() returns empty lists.

Garbled Chinese text in processing_lsv.py

All log messages in get_ir_from_eis() had corrupted characters rendering them unreadable. Reconstructed with correct Chinese and switched from print() to log().

# Before (garbled)
print(f"成功读取 {filepath}高频区选取 ????")
print(f"???频率范围: Z'={ir_value:.3f}Ω, Z''={z_imag[i]:.3f}?")

# After
log(f"无法读取文件 {filepath}, 所有编码均失败")
log(f"全局最小虚部: Z'={ir_value:.3f}Ω, Z''={z_imag[i]:.3f}Ω")

Empty-list guard after _filter_outliers()

_filter_outliers() can return empty lists, causing ValueError on subsequent min()/max() calls. Added a guard that skips the entire high-frequency analysis block when filtered data is empty.

Bare except: → typed exceptions

8 bare except: clauses (which swallow KeyboardInterrupt, SystemExit, etc.) replaced across processing_cv.py, processing_eis.py, processing_ecsa.py, tool_executor.py with except Exception: or except (ValueError, TypeError): as appropriate.

Debug print() → logging.debug()

3 print(f"[DEBUG] ...") calls in agent_controller.py and tool_executor.py replaced with _logger.debug(). 10 additional print() calls in the Tafel export section of processing_lsv.py converted to log() for consistency.

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