docs: switch chapter 1 to Charmcraft charm

[dwilding]

This is an intermediate PR for switching the Kubernetes charm tutorial to use uv and the latest Charmcraft profiles. Target branch is k8s-tutorial-uv

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This PR switches "Create a minimal Kubernetes charm" to use a charm project generated by the latest version of Charmcraft. That lets us remove several of the manual steps.

Preview doc

Not ready for review. Rebase after merging #2258.

[Copilot]

Pull request overview

This PR modernizes the Chapter 1 Kubernetes charm example to use the current Charmcraft initialization template and tooling. The changes transition from a manual charm setup to one generated by charmcraft init --profile kubernetes, incorporating modern Python project management with uv and updated testing infrastructure.

Key changes:

• Replaces manual charm creation steps with charmcraft init workflow
• Updates project structure to use pyproject.toml with dependency groups instead of requirements.txt
• Modernizes testing infrastructure with uv-based dependency management
• Updates copyright year from 2025 to 2026

Reviewed changes

Copilot reviewed 16 out of 17 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
examples/k8s-1-minimal/tox.ini	Updated to use uv-venv-lock-runner, dependency groups, reorganized test environments, and added format/lint configurations
examples/k8s-1-minimal/tests/unit/test_charm.py	Changed string quotes to double quotes, added testing documentation link
examples/k8s-1-minimal/tests/integration/test_charm.py	Updated string quotes, simplified docstrings, changed charm path handling to use resolve()
examples/k8s-1-minimal/tests/integration/conftest.py	Enhanced with better logging, CHARM_PATH environment variable support, and improved error handling
examples/k8s-1-minimal/src/charm.py	Changed all string literals to double quotes, simplified docstrings
examples/k8s-1-minimal/requirements.txt	Removed file (dependencies moved to pyproject.toml)
examples/k8s-1-minimal/pyproject.toml	Added comprehensive project configuration with dependency groups for lint, unit, and integration tests
examples/k8s-1-minimal/charmcraft.yaml	Modernized to use current Charmcraft format with base/platforms instead of bases, added uv plugin configuration
docs/tutorial/write-your-first-machine-charm.md	Updated tool installation instructions to mention uv separately from tox
docs/tutorial/from-zero-to-hero-write-your-first-kubernetes-charm/set-up-your-development-environment.md	Complete rewrite with detailed VM setup, Concierge installation, and project directory mounting instructions
docs/tutorial/from-zero-to-hero-write-your-first-kubernetes-charm/observe-your-charm-with-cos-lite.md	Updated VM name references from charm-dev to juju-sandbox-k8s, charm name from demo-api-charm to fastapi-demo, model name from welcome-k8s to testing
docs/tutorial/from-zero-to-hero-write-your-first-kubernetes-charm/make-your-charm-configurable.md	Updated charm and model name references to match new naming conventions
docs/tutorial/from-zero-to-hero-write-your-first-kubernetes-charm/integrate-your-charm-with-postgresql.md	Updated VM, charm, and model name references throughout
docs/tutorial/from-zero-to-hero-write-your-first-kubernetes-charm/expose-operational-tasks-via-actions.md	Updated charm and model name references in example commands
docs/tutorial/from-zero-to-hero-write-your-first-kubernetes-charm/create-a-minimal-kubernetes-charm.md	Major restructure to use charmcraft init workflow instead of manual file creation, updated all references to new naming conventions
.github/workflows/example-charm-integration-tests.yaml	Moved k8s-1-minimal from one test matrix to another

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