Move versions declaration in pyproject.toml (#700)

### Why

* Inspired by aeecleclair/Titan#480
* Now both the version of itself and of the Titan client are declared in
the TOML config file

### How

* I tried cleverly adding
[`toml_file="pyproject.toml",`](https://docs.pydantic.dev/latest/concepts/pydantic_settings/#other-settings-source)
in the `SettingsConfigDict` (line 49) so that the model would load
fields from both config files (`.env` and `pyproject.toml`), but it
seems Pydantic does not allow that at all...
* So I went using Python's *native*
[`tomllib`](https://docs.python.org/3/library/tomllib.html) TOML parser
: it the only solution that worked for me, and it's short.
* (The `with` is out of the class because Pydantic started crying about
the type of the bytes flow from reading the file)

###
[`pyproject.toml`](https://packaging.python.org/en/latest/guides/writing-pyproject-toml/)

* I just wanted to add
```toml
version = "4.3.3"
minimal-titan-version-code = 139
```
to the `[project]` table, but I realized it **didn't even exist**, so I
ended up writing the bare minimum.
* Perhaps we should fill this file seriously...
* it is powerful for automation and description (it could not hurt to
have it filled),
* and required to make a release on
[PyPI](https://pypi.org/user/ECLAIR/) (we already release CalypSSO and
the HA wrapper, why not Hyperion itself?).

Author: Marc-Andrieu

app/core/utils/config.py

@@ -1,4 +1,6 @@
+import tomllib
 from functools import cached_property
+from pathlib import Path
 from typing import Any
 
 import jwt
@@ -209,16 +211,25 @@ class Settings(BaseSettings):
     # If this token is not set, the service will not be able to access the data and no integrity check will be performed
     MYECLPAY_DATA_VERIFIER_ACCESS_TOKEN: str | None = None
 
-    #################################
-    # Hardcoded Hyperion parameters #
-    #################################
+    # Maximum wallet balance for MyECLPay in cents, we will prevent user from adding more money to their wallet if it will make their balance exceed this value
 
-    # Hyperion follows Semantic Versioning
-    # https://semver.org/
-    HYPERION_VERSION: str = "4.5.1"
-    MINIMAL_TITAN_VERSION_CODE: int = 139
+    #############################
+    # pyproject.toml parameters #
+    #############################
 
-    # Maximum wallet balance for MyECLPay in cents, we will prevent user from adding more money to their wallet if it will make their balance exceed this value
+    @computed_field  # type: ignore[prop-decorator]
+    @cached_property
+    def HYPERION_VERSION(cls) -> str:
+        with Path("pyproject.toml").open("rb") as pyproject_binary:
+            pyproject = tomllib.load(pyproject_binary)
+        return str(pyproject["project"]["version"])
+
+    @computed_field  # type: ignore[prop-decorator]
+    @cached_property
+    def MINIMAL_TITAN_VERSION_CODE(cls) -> str:
+        with Path("pyproject.toml").open("rb") as pyproject_binary:
+            pyproject = tomllib.load(pyproject_binary)
+        return str(pyproject["project"]["minimal-titan-version-code"])
 
     ######################################
     # Automatically generated parameters #
@@ -374,6 +385,8 @@ def init_cached_property(self) -> "Settings":
         By calling them in this validator, we force their initialization during the instantiation of the class.
         This allow them to raise error on Hyperion startup if they are not correctly configured instead of creating an error on runtime.
         """
+        self.HYPERION_VERSION  # noqa: B018
+        self.MINIMAL_TITAN_VERSION_CODE  # noqa: B018
         self.KNOWN_AUTH_CLIENTS  # noqa: B018
         self.RSA_PRIVATE_KEY  # noqa: B018
         self.RSA_PUBLIC_KEY  # noqa: B018

pyproject.toml

@@ -1,3 +1,19 @@
+[project]
+name = "hyperion"
+description = "Back-end of MyECL, the app of the students of École Centrale de Lyon, made by ÉCLAIR"
+readme = "README.md"
+authors = [{ name = "AEECL ECLAIR" }]
+
+# Hyperion follows Semantic Versioning
+# https://semver.org/
+version = "4.5.1"
+minimal-titan-version-code = 139
+requires-python = ">= 3.11, < 3.13"
+
+license = "MIT"
+license-files = ["LICENSE", "assets/privacy.txt", "assets/terms-and-conditions.txt", "assets/myeclpay-terms-of-service.txt"]
+
+
 [tool.ruff]
 # By default ruff also respect gitignore files
 # Same as Black.