fix: ensure config directory exists before mkstemp in _write_config_snapshot

[xiaoyuyu6420]

Problem

Three dashboard tests are intermittently failing on master (different ones fail on different runs):

• test_t2i_set_active_template_syncs_all_configs
• test_t2i_reset_default_template_syncs_all_configs
• test_t2i_update_active_template_reloads_all_schedulers

FileNotFoundError: [Errno 2] No such file or directory:
  '.../data/config/.abconf_<uuid>.json.<random>.tmp'

The traceback points to tempfile.mkstemp() inside AstrBotConfig._write_config_snapshot() (astrbot/core/config/astrbot_config.py:290).

Root Cause

_write_config_snapshot creates a temp file in the config file's parent directory, but never ensures that directory exists:

directory = os.path.dirname(os.path.abspath(self.config_path)) or "."
fd, temp_path = tempfile.mkstemp(dir=directory, ...)  # crashes if dir missing

When AstrBotConfig.__init__ (line 64-67) detects the config file doesn't exist yet, it calls save_config() → _write_config_snapshot → mkstemp(dir=directory). If the directory hasn't been created (fresh profile creation, test fixture race), mkstemp raises FileNotFoundError.

The create_conf path in astrbot_config_mgr.py:208-210 triggers this — it constructs a new conf_path and instantiates AstrBotConfig(config_path=conf_path, ...), which calls save_config() during __init__ before the directory is guaranteed to exist.

Fix

Add os.makedirs(directory, exist_ok=True) before the mkstemp call. One line, standard defensive pattern for atomic-write helpers.

Verification

Before fix (current master d2d7e5a):

3 failed, 79 deselected  (different tests fail each run)

After fix (5 consecutive runs):

3 passed, 79 deselected  (×5, stable)

Full suite: 2201 passed, 0 failed.

ruff format / ruff check clean.

Closes #9855.

Summary by Sourcery

Bug Fixes:

• Prevent configuration snapshot writes from failing when the target configuration directory does not yet exist.

[sourcery-ai]

Hey - I've reviewed your changes and they look great!

Sourcery assessment

Needs a human reviewer. If the path is wrong or directory creation has unintended side effects, merging can leave an extra directory on disk after the code is reverted. That state is bounded and can be removed manually; the normal failure mode is a config snapshot write error rather than irreversible data loss.

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[xiaoyuyu6420]

Friendly ping @Soulter — this is a 4-line fix (os.makedirs before mkstemp) for three intermittently-failing dashboard tests on master. CI workflows are awaiting fork-PR approval; Sourcery reviewed positively. Would appreciate a quick look when convenient.