Add vue-router, login/setup flow and backend logging

Refactor frontend to route-based navigation with vue-router, add
system setup and login pages with API integration. Add structured
logging, access-log middleware and startup lifecycle to FastAPI
backend.

server/src/app/core/config.py

@@ -44,7 +44,13 @@ class Settings(BaseSettings):
 
     redis_url: str | None = Field(default=None, alias="REDIS_URL")
     cors_origins: list[str] = Field(default_factory=list, alias="CORS_ORIGINS")
-    vite_api_base_url: str = Field(default="http://127.0.0.1:8000/api/v1", alias="VITE_API_BASE_URL")
+    vite_api_base_url: str = Field(
+        default="http://127.0.0.1:8000/api/v1", alias="VITE_API_BASE_URL"
+    )
+
+    log_level: str = Field(default="INFO", alias="LOG_LEVEL")
+    log_dir: str = Field(default="logs", alias="LOG_DIR")
+    log_file_enabled: bool = Field(default=True, alias="LOG_FILE_ENABLED")
 
     @property
     def resolved_database_url(self) -> str:

server/src/app/core/logging.py

@@ -0,0 +1,72 @@
+from __future__ import annotations
+
+import logging
+import sys
+from logging.handlers import RotatingFileHandler
+from pathlib import Path
+
+LOG_FORMAT = "%(asctime)s | %(levelname)-8s | %(name)s | %(message)s"
+DATE_FORMAT = "%Y-%m-%d %H:%M:%S"
+
+_LEVEL_COLORS: dict[int, str] = {
+    logging.DEBUG: "\033[36m",
+    logging.INFO: "\033[32m",
+    logging.WARNING: "\033[33m",
+    logging.ERROR: "\033[31m",
+    logging.CRITICAL: "\033[1;31m",
+}
+_RESET = "\033[0m"
+
+
+class _ColorFormatter(logging.Formatter):
+    def format(self, record: logging.LogRecord) -> str:
+        color = _LEVEL_COLORS.get(record.levelno, "")
+        record.levelname = f"{color}{record.levelname:<8}{_RESET}"
+        return super().format(record)
+
+
+def _build_console_handler(level: int) -> logging.StreamHandler:
+    handler = logging.StreamHandler(sys.stdout)
+    handler.setLevel(level)
+    handler.setFormatter(_ColorFormatter(LOG_FORMAT, datefmt=DATE_FORMAT))
+    return handler
+
+
+def _build_file_handler(log_dir: Path, level: int) -> RotatingFileHandler:
+    log_dir.mkdir(parents=True, exist_ok=True)
+    handler = RotatingFileHandler(
+        log_dir / "app.log",
+        maxBytes=10 * 1024 * 1024,
+        backupCount=10,
+        encoding="utf-8",
+    )
+    handler.setLevel(level)
+    handler.setFormatter(logging.Formatter(LOG_FORMAT, datefmt=DATE_FORMAT))
+    return handler
+
+
+def setup_logging(
+    *,
+    level: str = "INFO",
+    log_dir: str = "logs",
+    enable_file: bool = True,
+) -> None:
+    numeric_level = getattr(logging, level.upper(), logging.INFO)
+    root = logging.getLogger()
+    root.setLevel(numeric_level)
+    root.handlers.clear()
+
+    root.addHandler(_build_console_handler(numeric_level))
+
+    if enable_file:
+        from app.core.config import SERVER_DIR
+
+        file_path = SERVER_DIR / log_dir
+        root.addHandler(_build_file_handler(file_path, numeric_level))
+
+    logging.getLogger("uvicorn.access").setLevel(logging.WARNING)
+    logging.getLogger("sqlalchemy.engine").setLevel(logging.WARNING)
+
+
+def get_logger(name: str) -> logging.Logger:
+    return logging.getLogger(name)