feat(services): create mana-subscriptions, remove from mana-core-auth

Extract subscription billing into standalone mana-subscriptions service
(Hono + Bun, Port 3063). Also removes Stripe module from mana-core-auth
since subscription webhooks are the last consumer.

New service (services/mana-subscriptions/):
- Plans CRUD, subscription management, Stripe Checkout + Portal
- Invoice tracking, webhook handlers for sub/invoice events
- Internal API for plan limits (consumed by guilds service)
- ~990 LOC (vs ~1,700 in NestJS incl. Stripe module)

Removed from mana-core-auth:
- subscriptions/ module (6 files)
- stripe/ module (4 files) — no longer needed in auth
- db/schema/subscriptions.schema.ts
- guilds.service.ts: replaced direct DB plan limit query with
  HTTP call to mana-subscriptions internal API

mana-core-auth now contains only:
- Auth (Better Auth, JWT, Sessions, 2FA, Passkeys, OIDC)
- Organizations/Guilds (membership only, no credits/plans)
- API Keys, Security, Me (GDPR), Health, Metrics
- Feedback + Analytics (next extraction target)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

services/mana-crawler/Dockerfile

@@ -1,56 +0,0 @@
-# syntax=docker/dockerfile:1
-# Build stage
-FROM node:20-alpine AS builder
-
-RUN corepack enable && corepack prepare pnpm@9.15.0 --activate
-
-WORKDIR /app
-
-# Copy workspace files
-COPY pnpm-workspace.yaml ./
-COPY pnpm-lock.yaml ./
-COPY package.json ./
-
-# Copy service files
-COPY services/mana-crawler/package.json ./services/mana-crawler/
-
-# Copy shared packages
-COPY packages/shared-drizzle-config/package.json ./packages/shared-drizzle-config/
-
-# Install dependencies
-RUN --mount=type=cache,id=pnpm,target=/root/.local/share/pnpm/store pnpm install --frozen-lockfile
-
-# Copy source code
-COPY services/mana-crawler ./services/mana-crawler
-COPY packages/shared-drizzle-config ./packages/shared-drizzle-config
-
-# Build
-WORKDIR /app/services/mana-crawler
-RUN pnpm build
-
-# Production stage
-FROM node:20-alpine AS runner
-
-RUN corepack enable && corepack prepare pnpm@9.15.0 --activate
-
-WORKDIR /app
-
-# Copy package files
-COPY --from=builder /app/pnpm-workspace.yaml ./
-COPY --from=builder /app/pnpm-lock.yaml ./
-COPY --from=builder /app/package.json ./
-COPY --from=builder /app/services/mana-crawler/package.json ./services/mana-crawler/
-COPY --from=builder /app/packages/shared-drizzle-config/package.json ./packages/shared-drizzle-config/
-
-# Install production dependencies only
-RUN --mount=type=cache,id=pnpm,target=/root/.local/share/pnpm/store pnpm install --frozen-lockfile --prod
-
-# Copy built files
-COPY --from=builder /app/services/mana-crawler/dist ./services/mana-crawler/dist
-COPY --from=builder /app/packages/shared-drizzle-config/dist ./packages/shared-drizzle-config/dist
-
-WORKDIR /app/services/mana-crawler
-
-EXPOSE 3023
-
-CMD ["node", "dist/main"]