feat: add path helper functions to file_service

- get_app_dir(): project root in dev, exe dir in PyInstaller bundle
- get_resource_path/get_config_path: paths under app dir
- get_log_dir/get_output_dir: auto-create and return logs/ and output/
- Refactor log_service to use get_log_dir() instead of own __file__ calc

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/services/file_service.py

@@ -1,5 +1,51 @@
+import logging
+import sys
+from pathlib import Path
+
+logger = logging.getLogger(__name__)
+
 SUPPORTED_IMAGE_EXTENSIONS = {".png", ".jpg", ".jpeg", ".webp"}
 
 
 def is_supported_image(path):
     return path.suffix.lower() in SUPPORTED_IMAGE_EXTENSIONS
+
+
+# ---------------------------------------------------------------------------
+# Path helpers
+# ---------------------------------------------------------------------------
+
+def get_app_dir():
+    """Return the application root directory as a Path.
+
+    PyInstaller onedir: directory that contains the .exe.
+    Development: project root (three levels above this file:
+        src/services/file_service.py -> src/services -> src -> project root).
+    """
+    if getattr(sys, "frozen", False):
+        return Path(sys.executable).resolve().parent
+    return Path(__file__).resolve().parent.parent.parent
+
+
+def get_resource_path(relative_path):
+    """Return absolute Path for a file under <app_dir>/resources/."""
+    return get_app_dir() / "resources" / relative_path
+
+
+def get_config_path(relative_path):
+    """Return absolute Path for a file under <app_dir>/config/."""
+    return get_app_dir() / "config" / relative_path
+
+
+def get_log_dir():
+    """Return <app_dir>/logs/ as a Path, creating the directory if absent."""
+    d = get_app_dir() / "logs"
+    d.mkdir(exist_ok=True)
+    return d
+
+
+def get_output_dir():
+    """Return <app_dir>/output/ as a Path, creating the directory if absent."""
+    d = get_app_dir() / "output"
+    d.mkdir(exist_ok=True)
+    return d

src/services/log_service.py

@@ -6,28 +6,32 @@ from datetime import datetime
 def setup_logging(log_dir=None):
     """Initialize file + console logging. Call once at application startup.
 
-    log_dir: absolute path to log directory. Defaults to <project_root>/logs/.
-    If the directory cannot be created, falls back to console-only logging.
+    log_dir: str or Path to log directory. Defaults to <app_dir>/logs/ via
+             file_service.get_log_dir(). Falls back to console-only if the
+             directory cannot be created.
     """
     if log_dir is None:
-        # src/services/log_service.py -> src/services -> src -> project root
-        _here = os.path.dirname(os.path.abspath(__file__))
-        log_dir = os.path.join(os.path.dirname(os.path.dirname(_here)), "logs")
-
-    try:
-        os.makedirs(log_dir, exist_ok=True)
-    except OSError as exc:
-        logging.basicConfig(
-            level=logging.INFO,
-            format="%(asctime)s %(name)s %(levelname)s %(message)s",
-        )
-        logging.getLogger(__name__).warning(
-            "Cannot create log directory %s: %s. Falling back to console only.", log_dir, exc
-        )
-        return
+        try:
+            from services.file_service import get_log_dir
+            log_dir = get_log_dir()
+        except OSError as exc:
+            _setup_console_only()
+            logging.getLogger(__name__).warning(
+                "Cannot create log directory: %s. Falling back to console only.", exc
+            )
+            return
+    else:
+        try:
+            os.makedirs(str(log_dir), exist_ok=True)
+        except OSError as exc:
+            _setup_console_only()
+            logging.getLogger(__name__).warning(
+                "Cannot create log directory %s: %s. Falling back to console only.", log_dir, exc
+            )
+            return
 
     timestamp = datetime.now().strftime("%Y%m%d_%H%M%S")
-    log_file = os.path.join(log_dir, "app_{}.log".format(timestamp))
+    log_file = os.path.join(str(log_dir), "app_{}.log".format(timestamp))
 
     formatter = logging.Formatter("%(asctime)s %(name)s %(levelname)s %(message)s")
 
@@ -43,3 +47,10 @@ def setup_logging(log_dir=None):
     root.addHandler(sh)
 
     logging.getLogger(__name__).info("Logging initialized. Log file: %s", log_file)
+
+
+def _setup_console_only():
+    logging.basicConfig(
+        level=logging.INFO,
+        format="%(asctime)s %(name)s %(levelname)s %(message)s",
+    )

tasks.md

@@ -87,18 +87,18 @@
 
 任务：
 
-- [ ] 在 `src/services/file_service.py` 中新增路径辅助函数（不单独建模块）
-- [ ] 实现 `get_app_dir()`：返回程序根目录，兼容开发环境和 PyInstaller 打包环境
-- [ ] 实现 `get_resource_path(relative_path)`：返回资源文件绝对路径
-- [ ] 实现 `get_config_path(relative_path)`：返回配置文件绝对路径
-- [ ] 实现 `get_log_dir()`：返回日志目录路径
-- [ ] 实现 `get_output_dir()`：返回默认输出目录路径
-- [ ] 保证 Windows 中文路径可用
+- [x] 在 `src/services/file_service.py` 中新增路径辅助函数（不单独建模块）
+- [x] 实现 `get_app_dir()`：返回程序根目录，兼容开发环境和 PyInstaller 打包环境
+- [x] 实现 `get_resource_path(relative_path)`：返回资源文件绝对路径
+- [x] 实现 `get_config_path(relative_path)`：返回配置文件绝对路径
+- [x] 实现 `get_log_dir()`：返回日志目录路径
+- [x] 实现 `get_output_dir()`：返回默认输出目录路径
+- [x] 保证 Windows 中文路径可用
 
 验收：
 
-- [ ] 路径函数不使用开发机绝对路径
-- [ ] 程序目录下缺少 `logs/` 或 `output/` 时可自动创建
+- [x] 路径函数不使用开发机绝对路径
+- [x] 程序目录下缺少 `logs/` 或 `output/` 时可自动创建
 
 ### 1.3 配置服务