fix: Adapt versioning scheme to Home Assistant and switch to uv (#896)

Home Assistant expects versioning always increases numbers. Add
a date component to the development version to comply with this
expectation. The scheme is now 0.0.0.dev<date><hash>.

Use uv for creating and managing the virtual environment for developement.
This enourmously speeds up dependency updates. For this change
dependency requirements are now solely handled in pyproject.toml.
requirements.tx and requirements-dev.txt are deleted.

Signed-off-by: Bobby Noelte <b0661n0e17e@gmail.com>

tests/conftest.py

@@ -24,7 +24,7 @@ from xprocess import ProcessStarter, XProcess
 
 from akkudoktoreos.config.config import ConfigEOS
 from akkudoktoreos.core.coreabc import get_config, get_prediction, singletons_init
-from akkudoktoreos.core.version import _version_hash, version
+from akkudoktoreos.core.version import _version_date_hash, version
 from akkudoktoreos.server.server import get_default_host
 
 # -----------------------------------------------
@@ -510,26 +510,41 @@ def server_base(
         if extra_env:
             env.update(extra_env)
 
-        # assure server to be installed
-        try:
-            project_dir = Path(__file__).parent.parent
-            subprocess.run(
-                [sys.executable, "-c", "import", "akkudoktoreos.server.eos"],
-                check=True,
-                env=env,
-                stdout=subprocess.PIPE,
-                stderr=subprocess.PIPE,
-                cwd=project_dir,
-            )
-        except subprocess.CalledProcessError:
-            subprocess.run(
-                [sys.executable, "-m", "pip", "install", "-e", str(project_dir)],
-                env=env,
-                check=True,
-                stdout=subprocess.PIPE,
-                stderr=subprocess.PIPE,
-                cwd=project_dir,
-            )
+        project_dir = Path(__file__).parent.parent
+
+        @staticmethod
+        def _ensure_package(env: dict, project_dir: Path) -> None:
+            """Ensure 'akkudoktoreos' is importable in this Python environment."""
+            try:
+                subprocess.run(
+                    [sys.executable, "-c", "import akkudoktoreos.server.eos"],
+                    check=True,
+                    env=env,
+                    stdout=subprocess.PIPE,
+                    stderr=subprocess.PIPE,
+                    cwd=project_dir,
+                )
+            except subprocess.CalledProcessError:
+                # If inside a normal venv or uv-managed environment, install in place
+                uv_root = os.getenv("UV_VENV_ROOT")  # set by uv if active
+                venv_active = hasattr(sys, "real_prefix") or sys.prefix != sys.base_prefix
+                if uv_root or venv_active:
+                    print("Package not found, installing in current environment...")
+                    subprocess.run(
+                        [sys.executable, "-m", "pip", "install", "-e", str(project_dir)],
+                        check=True,
+                        env=env,
+                        stdout=subprocess.PIPE,
+                        stderr=subprocess.PIPE,
+                        cwd=project_dir,
+                    )
+                else:
+                    raise RuntimeError(
+                        "Cannot import 'akkudoktoreos.server.eos' in the system Python. "
+                        "Activate a virtual environment first."
+                    )
+
+        _ensure_package(env, project_dir)
 
         # Set command to start server process
         args = [
@@ -644,7 +659,7 @@ def version_and_hash() -> Generator[dict[str, Optional[str]], None, None]:
     Runs once per test session.
     """
     info = version()
-    info["hash_current"] = _version_hash()
+    _, info["hash_current"] = _version_date_hash()
 
     yield info