Make conandeps installable with uv

Add a hatchling build backend, a `conandeps` console script and a uv.lock
so `uv tool install .` (or from a git URL) yields a `conandeps` command in
an isolated venv. Add PEP 723 inline metadata to conandeps.py so the single
file also works standalone via `uv run conandeps.py`.

Pin requires-python to <3.12: Conan 1.x imports the removed `imp` module
(the Containerfile comment wrongly blamed distutils). Add uv to the dev
image so both install paths are verified inside the container.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EYNdaGDrpaqDyT8QtrTQbM

README.md

@@ -15,6 +15,28 @@ Given a `conanfile.py`, `conandeps` reports:
   dependency declared) – shown both as a list and on the edges of the
   dependency tree.
 
+### Installing with uv
+
+```
+uv tool install git+https://<your-forge>/conan-utils   # or: uv tool install . from a checkout
+conandeps path/to/conanfile.py -r knor
+```
+
+This puts a `conandeps` command on your PATH in its own virtualenv with
+Conan 1.66 — it does not touch or depend on the Conan you use for builds
+(but it does read the same `~/.conan` config, profiles and remotes).
+
+The script also carries PEP 723 inline metadata, so the single file works on
+its own without a checkout:
+
+```
+uv run conandeps.py path/to/conanfile.py -r knor
+```
+
+Python 3.8–3.11 is required; Conan 1.x does not run on 3.12+.
+
+### Usage
+
 ```
 ./conandeps.py path/to/conanfile.py -r knor                  # text report
 ./conandeps.py path/to/conanfile.py -r knor -pr myprofile    # explicit profile