fix: remove unused imports across 21 modules

[Kailigithub]

Summary

Removes 40 unused imports across 21 Python modules, reducing code clutter and improving static analysis accuracy.

Changes

Removed unused imports detected by ruff check --select F401. Side-effect imports (readline for REPL history, chatapp_common for monkey-patching) were preserved with # noqa: F401 annotations.

File	Removed Imports
assets/agent_bbs.py	JSONResponse
assets/code_run_header.py	json, re, time
frontends/conductor.py	json, typing.Any
frontends/dcapp.py	build_done_text
frontends/qtapp.py	Signal, QMetaObject, Q_ARG, QObject, clean_reply, build_done_text, os
frontends/tui_v3.py	select, signal, lru_cache, Callable
frontends/tuiapp.py	time
frontends/wechatapp.py	math
frontends/wecomapp.py	typing.Dict
llmcore.py	base64
memory/L4_raw_sessions/compress_session.py	json, ast
memory/autonomous_operation_sop/helper.py	os
memory/ljqCtrl.py	sys, random, math, ImageEnhance, ImageFilter, ImageDraw
memory/procmem_scanner.py	sys, os
memory/ui_detect.py	os
plugins/langfuse_tracing.py	sys
reflect/agent_team_worker.py	time
reflect/checklist_master.py	time
simphtml.py	os

Preserved with # noqa: F401:

• agentmain.py: readline (side-effect: enables REPL history)
• frontends/stapp.py: chatapp_common (side-effect: activates /continue command via monkey-patching)

Verification

• ruff check --select F401 reports 0 remaining unused imports
• All 21 modified files pass py_compile syntax check
• Side-effect imports preserved and annotated