fix(cli): apply --deps.never-bundle by camel-casing dotted flag keys

[dylanpulver]

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Description

--deps.never-bundle has been a no-op since the deps namespace rename (7f50966). cac's camelcaseOptionName camel-cases only the first segment of a dotted option name, so the flag parses to deps['never-bundle'] while resolveDepsConfig reads deps.neverBundle. Nothing errors, because the command sets allowUnknownOptions.

On main, with leftpad present in node_modules:

tsdown --deps.never-bundle leftpad   # leftpad inlined into the bundle
tsdown --deps.neverBundle leftpad    # leftpad external
tsdown --external leftpad            # leftpad external (deprecated flag)

Renaming the option to --deps.neverBundle was the alternative. That leaves the kebab spelling silently doing nothing, and the kebab spelling is what docs/reference/cli.md and skills/tsdown/references/ document, so this normalizes the parsed keys and both spellings work.

Normalization is scoped to flags.deps at one level. --env.* is excluded since its keys are user-supplied variable names. A future dotted option in another namespace would need the same handling.

src/cli.test.ts parses through the real cli instance, which required exporting it. The first case fails on main; the other two pin current behavior.

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commit: 72781b9