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>

scripts/cz_check_branch.py

@@ -11,16 +11,40 @@ import sys
 from pathlib import Path
 
 
-def find_cz() -> str:
-    venv = os.getenv("VIRTUAL_ENV")
-    paths = [Path(venv)] if venv else []
-    paths.append(Path.cwd() / ".venv")
+def find_cz() -> list[str]:
+    """Return command to invoke Commitizen via virtualenv or globally."""
+    candidates = []
 
-    for base in paths:
-        cz = base / ("Scripts" if os.name == "nt" else "bin") / ("cz.exe" if os.name == "nt" else "cz")
-        if cz.exists():
-            return str(cz)
-    return "cz"
+    # 1️⃣ Currently active virtualenv
+    venv = os.getenv("VIRTUAL_ENV")
+    if venv:
+        candidates.append(Path(venv))
+
+    # 2️⃣ uv-managed virtualenv
+    uv_venv = Path(".uv") / "venv"
+    if uv_venv.exists():
+        candidates.append(uv_venv)
+
+    # 3️⃣ traditional .venv
+    dot_venv = Path(".venv")
+    if dot_venv.exists():
+        candidates.append(dot_venv)
+
+    # Check each candidate for Commitizen binary
+    for base in candidates:
+        cz_path = base / ("Scripts" if os.name == "nt" else "bin") / ("cz.exe" if os.name == "nt" else "cz")
+        if cz_path.exists():
+            return [str(cz_path)]
+
+    # 4️⃣ fallback to uv run cz
+    try:
+        subprocess.run(["uv", "run", "cz", "--version"], check=True, stdout=subprocess.DEVNULL)
+        return ["uv", "run", "cz"]
+    except (subprocess.CalledProcessError, FileNotFoundError):
+        pass
+
+    # 5️⃣ fallback to system cz
+    return ["cz"]
 
 
 def main():