fix(registry): copy + build schemas workspace package in Dockerfile

#100 switched the registry's `@nimblebrain/mpak-schemas` dep from
`^0.2.0` (published) to `workspace:*`, so pnpm now expects the
package source on disk instead of pulling from npm. The Dockerfile
only copied `apps/registry/`, never `packages/schemas/` — the
registry build then errored with `Cannot find module
'@nimblebrain/mpak-schemas' or its corresponding type declarations`
across every file that imports the package.

Builder stage:
- COPY packages/schemas source files (package.json, tsconfig, tsup
  config, src/) before pnpm install so the workspace:* link resolves.
- Run `pnpm --filter @nimblebrain/mpak-schemas build` (tsup) before
  the registry build so its dist/ exists for the registry's tsc to
  consume.

Production stage:
- The schemas package is a runtime dep too (Zod schemas like
  ServerDetailSchema are runtime values, not type-only imports). COPY
  the package.json and the prebuilt dist from the builder so the
  workspace:* link resolves at install time without rebuilding.

No other workspace packages are runtime deps of the registry — only
schemas.

Author: mgoldsborough

apps/registry/Dockerfile

@@ -8,14 +8,22 @@ WORKDIR /app
 # Copy workspace config
 COPY pnpm-workspace.yaml package.json pnpm-lock.yaml tsconfig.base.json ./
 
+# Copy the schemas workspace package — registry depends on it via
+# `workspace:*` so pnpm needs the source on disk to resolve the link.
+COPY packages/schemas/package.json packages/schemas/tsconfig.json packages/schemas/tsup.config.ts ./packages/schemas/
+COPY packages/schemas/src/ ./packages/schemas/src/
+
 # Copy the registry app
 COPY apps/registry/package.json apps/registry/tsconfig.json apps/registry/prisma.config.ts ./apps/registry/
 COPY apps/registry/prisma/ ./apps/registry/prisma/
 COPY apps/registry/src/ ./apps/registry/src/
 
-# Install dependencies
+# Install dependencies (resolves the workspace:* link to packages/schemas)
 RUN pnpm install --frozen-lockfile
 
+# Build the schemas package first — registry imports its compiled dist.
+RUN pnpm --filter @nimblebrain/mpak-schemas build
+
 # Generate Prisma client
 RUN cd apps/registry && npx prisma generate
 
@@ -32,10 +40,16 @@ WORKDIR /app
 # Copy workspace config
 COPY pnpm-workspace.yaml package.json pnpm-lock.yaml ./
 
+# Copy the schemas workspace package (runtime dep — registry imports
+# Zod schemas like `ServerDetailSchema` at runtime, not just types).
+COPY packages/schemas/package.json ./packages/schemas/
+COPY --from=builder /app/packages/schemas/dist/ ./packages/schemas/dist/
+
 # Copy the registry app package.json
 COPY apps/registry/package.json ./apps/registry/
 
-# Install production dependencies only
+# Install production dependencies only (workspace:* schemas resolves
+# to the dist we just copied above).
 RUN pnpm install --frozen-lockfile --prod
 
 # Copy Prisma schema and generated client (Prisma 7 generates to hoisted node_modules)