fix(docker): copy src/shared into runtime image for server imports

src/server/auth/types.ts imports runtime values (role constants,
canAccessScheduling helper) from src/shared/auth/roles.ts — without
the shared folder in the final stage the server crashes with
ERR_MODULE_NOT_FOUND. Existing shared/scheduling imports survived
only because they were type-only and elided at runtime.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Dockerfile

@@ -13,6 +13,7 @@ COPY package.json package-lock.json ./
 RUN npm ci --omit=dev
 COPY --from=builder /app/dist ./dist
 COPY src/server ./src/server
+COPY src/shared ./src/shared
 COPY tsconfig.json ./
 
 EXPOSE 3001