feat(stack): add support for container templates

[martin-helmich]

Implements #2048: support for container templates in mw stack.

Commands

New

• mw stack create — creates a stack, either empty or from a container template via --from-template <template-id>. Fetches the template, resolves its userInputs, and calls the create-stack API with templateConfig. Template inputs are supplied non-interactively with repeatable --input name=value flags; any required input without a value or default is prompted for interactively. Supports -c/--update-context to point the CLI context at the new stack.
• mw stack template list (alias stack template ls) — lists available container templates so users can discover template IDs. Filterable with --category and --type component|standalone, which map to the corresponding query parameters (omitted from the request when unset).
• mw stack template install <template-id> — installs a template into an existing stack via the add-template-component operation, rather than creating a new stack. Stack comes from the CLI context or --stack-id; user inputs are resolved exactly as in stack create.

Changed

• mw stack list — now shows a Template column with the originating templateId (or "no template").
• mw stack rm — now works for template and non-template stacks alike. A project's default stack (where the stack ID equals the project ID) still cannot be removed and is emptied instead, by declaring it without services or volumes; --with-volumes additionally removes its volumes. Any other stack is removed with a single delete-stack call, replacing the previous not implemented error.
• mw stack deploy --from-template — deprecated in favour of mw stack create --from-template; the flag now emits a deprecation notice pointing there (it used an older, GitHub-based template mechanism).

Removal of default-stack assumptions

Now that stacks other than the project's default one are first-class, the stack, container and volume commands were swept for logic that only ever worked against the default stack. Three commands derived the stack ID directly from the project ID (const stackId = projectId) and so could not address any other stack:

• mw container run
• mw volume create
• mw volume rm

All three now take an optional -s/--stack-id flag, resolved by the new withStackIdOrDefault() helper in the order: explicit flag → CLI context → the project's default stack. Existing invocations keep working unchanged.

The remaining container commands resolve the stack from the container itself (withContainerAndStackId, which looks the container up project-wide and returns its actual stackId), so they already worked for any stack.

Masked input for sensitive values

Templates mark sensitive inputs with a validation schema of format password. Prompts for those inputs are now masked — the value is not echoed while typing and shows as [secret] in the process summary instead of in clear text.

Supporting code + tests

• src/lib/resources/stack/template-inputs.ts — collectTemplateUserInputs, shared by stack create and stack template install. Value precedence: explicitly provided → template default → interactive prompt. Optional inputs without a value are omitted so the API fills them from template defaults; unknown provided inputs emit a warning. Also holds isSensitiveInput(), which reads the validationSchema described above and tolerates a missing or malformed schema.
• src/lib/resources/stack/flags.ts — optionalStackFlags / withStackIdOrDefault() for the default-stack fallback described above.
• Unit tests for the input-resolution logic, the masking behaviour and the sensitivity detection.

Notes

• The new commands live under a template subtopic of stack, registered in package.json, matching the singular naming used by all other topics.
• --with-volumes on stack rm now only has an effect on the default stack, since a regular stack's volumes are removed together with the stack; this is called out in the flag description.
• Docs under docs/ are left to the existing re-generation workflow rather than being regenerated by hand.

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