refactor(repo): conform structure to AGENTS.md (web->frontend, internal/api->cmd/webui/{api,handlers}, docs/README+CHANGELOGs, module .gitignores, drop stray library/ and committed debug bins)

frontend/Dockerfile.dev

@@ -1,6 +1,6 @@
 FROM node:22 AS dev
 WORKDIR /app
-COPY web/package.json web/package-lock.json ./
+COPY frontend/package.json web/package-lock.json ./
 RUN npm ci
 EXPOSE 5173
 CMD ["npm", "run", "dev", "--", "--host", "0.0.0.0"]

frontend/Dockerfile.prod

@@ -1,8 +1,8 @@
 FROM node:22-alpine AS build
 WORKDIR /src
-COPY web/package.json web/package-lock.json ./
+COPY frontend/package.json web/package-lock.json ./
 RUN npm ci
-COPY web/ ./
+COPY frontend/ ./
 RUN npm run build
 
 FROM nginx:1.27-alpine AS runner