fix(docker): copy plugin tsconfig.base.json for tsc build (#156)
The plugin-signatures tsconfig.json extends ../../tsconfig.base.json
(the barazo-plugins monorepo root), but the Dockerfile only copied
the plugin subdirectory. Without the base config, tsc falls back to
defaults (no skipLibCheck, no esModuleInterop), causing hundreds of
type errors from node_modules.
Fixes staging deploy failure after workspace glob fix (#102).
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