refactor: large codebase cleanup - consolidate schemas, migrate to Drizzle ORM, extract frontend components, modernize Docker builds

- Consolidate all DB schema definitions into packages/shared as single source of truth
- Migrate backend from raw SQL to Drizzle ORM across all modules
- Extract frontend inline UI into separate component files
- Refactor discord-gateway circuitBreaker into conversationState + moderationState
- Convert messageStore to Proxy singleton pattern
- Add validateBody/validateQuery middleware + Zod schemas for API endpoints
- Modernize Docker builds with multi-stage + pnpm deploy
- Migrate CI/CD from deployment to image-based pipeline
- Remove 60+ unused/dead files (~15K lines)
- Update color scheme from sky-blue to teal-cyan
- Move DB connection management to @bete/shared/database

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

infra/docker/Dockerfile.proxy

@@ -1,32 +1,56 @@
-# ---- Builder Stage (Frontend WASM) ----
-FROM rust:alpine AS frontend-builder
-
-RUN apk add --no-cache musl-dev
-RUN rustup target add wasm32-unknown-unknown
-RUN cargo install trunk --version 0.22.0-beta.1 --locked
+# ---- Stage 1: Build Next.js static export ----
+FROM node:22-slim AS frontend-builder
 
 WORKDIR /app
 
-# Copy workspace definition and lock file for dependency caching
-COPY services/frontend/Cargo.toml services/frontend/Cargo.lock ./
+# Install pnpm
+RUN corepack enable
 
-# Copy shared-types library
-COPY services/frontend/shared-types ./shared-types/
+# Install build essentials for native deps
+RUN apt-get update -qq && apt-get install -y -qq --no-install-recommends \
+    python3 make g++ && rm -rf /var/lib/apt/lists/*
 
-# Copy frontend source
-COPY services/frontend/frontend ./frontend/
+# Copy dependency manifests first for layer caching
+COPY pnpm-lock.yaml pnpm-workspace.yaml package.json ./
+COPY packages/shared/package.json ./packages/shared/package.json
+COPY services/frontend/package.json ./services/frontend/package.json
+COPY services/frontend/tsconfig.json ./services/frontend/tsconfig.json
 
-# Build WASM bundle via trunk
-RUN cd frontend && trunk build --release
+# Copy patches (pnpm patchedDependencies)
+COPY patches/ ./patches/
 
-# ---- Runner Stage ----
+# Install dependencies (frontend + shared)
+RUN --mount=type=cache,id=pnpm-store,target=/root/.local/share/pnpm/store \
+    pnpm install --no-frozen-lockfile --filter './packages/shared' --filter './services/frontend'
+
+# Copy source code
+COPY packages/shared/ ./packages/shared/
+COPY services/frontend/ ./services/frontend/
+
+# Pass API/WS URLs as build args
+ARG VITE_BE_API_URL
+ARG VITE_BE_WS_URL
+ENV VITE_BE_API_URL=${VITE_BE_API_URL}
+ENV VITE_BE_WS_URL=${VITE_BE_WS_URL}
+
+# Build shared lib first, then frontend static export
+RUN --mount=type=cache,id=pnpm-store,target=/root/.local/share/pnpm/store \
+    pnpm --filter './packages/shared' run build
+RUN --mount=type=cache,id=pnpm-store,target=/root/.local/share/pnpm/store \
+    pnpm --filter frontend run build
+
+# ---- Stage 2: Nginx ----
 FROM nginx:alpine
 
+# Nginx config (API/WS proxy + static file serving)
 COPY infra/docker/nginx/nginx.conf /etc/nginx/conf.d/default.conf
 
-# Copy frontend static files from builder stage
-COPY --from=frontend-builder /app/frontend/dist /usr/share/nginx/html
+# Static export from frontend builder
+COPY --from=frontend-builder /app/services/frontend/out/ /usr/share/nginx/html/
 
 EXPOSE 80
 
+HEALTHCHECK --interval=30s --timeout=3s --start-period=10s --retries=3 \
+  CMD wget -qO- http://localhost:80/ || exit 1
+
 CMD ["nginx", "-g", "daemon off;"]