[good-first-issue] v1: convert cache-controller logging to %-format

Follow-up for #5118 after #5125.

#5125 enabled Ruff G004 repo-wide and added temporary per-file-ignores for the files/directories that still build logging messages with f-strings. This issue is one small slice of that cleanup queue.

Claiming: please comment /claim and wait for assignment so we avoid duplicate PRs.

Scope

Convert only the logging f-strings in:

• lmcache/v1/cache_controller/controller_manager.py (5 G004 findings)
• lmcache/v1/cache_controller/executor.py (5 G004 findings)
• lmcache/v1/cache_controller/worker.py (2 G004 findings)

Counts above were measured on dev at dd5dfca with ruff check --isolated --select G004.

Expected change

• Replace logging f-strings with lazy %-style logging arguments, for example logger.info("loaded %s tokens", num_tokens).
• Preserve the rendered log text and behavior.
• Do not change non-logging f-strings or unrelated control flow.
• Remove the matching G004 ignore entry/entries from pyproject.toml once the listed paths are clean.

Matching ignore entry/entries:

• "lmcache/v1/cache_controller/controller_manager.py" = ["G004"]
• "lmcache/v1/cache_controller/executor.py" = ["G004"]
• "lmcache/v1/cache_controller/worker.py" = ["G004"]

For a ** directory ignore, delete the directory entry only when the whole listed directory is clean. If a merge conflict leaves other unmigrated files in that ignored directory, replace the broad ** entry with explicit file-level entries for the leftovers.

Verification

ruff check --isolated --select G004 lmcache/v1/cache_controller/controller_manager.py lmcache/v1/cache_controller/executor.py lmcache/v1/cache_controller/worker.py
ruff check --select G004 lmcache/v1/cache_controller/controller_manager.py lmcache/v1/cache_controller/executor.py lmcache/v1/cache_controller/worker.py pyproject.toml
pre-commit run --all-files

The first command should report zero findings after the cleanup. The second command verifies the repo config still passes after removing the ignore entry/entries.

Refs #5118 Refs #3372 Refs #5125