Add auto update for the app

[windfox1243]

As the title say, we usually have new version, so i think something like auto-update worth it

[hydropix]

Done in v1.3.7.

The web UI now checks GitHub releases on startup and shows an Update available banner when a newer version is published. Clicking Update now runs git pull + pip install (only if requirements.txt changed) and restarts the server automatically when launched via start.bat / start.sh (they now loop on exit code 42). The banner is suppressed if a translation is running, and disabled when the install is not a git checkout (zip / PyInstaller bundle) so users get pointed to the release page instead.

Endpoints added: GET /api/version/check, POST /api/version/update, GET /api/version/update/status.

You'll see it the next time a release tag is newer than your local version. To test now, you can run setup-and-update.bat (or pull manually) to get v1.3.7.

[yakubka]

FastAPI delegates JSON decoding to Pydantic, which in turn uses the standard json module (or optionally orjson). Neither of them surfaces line and column numbers in their JSONDecodeError by default when the error propagates through Pydantic's validation pipeline.

The JSONDecodeError from the stdlib does carry .lineno and .colno attributes, but Pydantic wraps the exception into its own ValidationError and only keeps the message string.

The practical workaround is to add a custom exception handler that catches the raw decode error before Pydantic sees it.

from fastapi import Request
from fastapi.responses import JSONResponse
import json

@app.exception_handler(json.JSONDecodeError)
async def json_decode_error_handler(request: Request, exc: json.JSONDecodeError):
    return JSONResponse(
        status_code=422,
        content={
            "detail": exc.msg,
            "line": exc.lineno,
            "column": exc.colno,
            "position": exc.pos,
        },
    )

This only catches errors that happen before Pydantic validation, so it covers malformed JSON bodies. Errors that pass JSON parsing but fail schema validation are a separate path and do not have line numbers because the input has already been decoded into a Python object.