fix: npm install instead of npm ci (no lockfile)

Dockerfile

@@ -5,7 +5,7 @@ WORKDIR /app
 
 # Install dependencies (including dev deps for tsc)
 COPY package*.json ./
-RUN npm ci
+RUN npm install
 
 # Copy source and compile TypeScript
 COPY tsconfig.json ./
@@ -19,7 +19,7 @@ WORKDIR /app
 
 # Production deps only — also rebuild better-sqlite3 for Alpine (musl libc)
 COPY package*.json ./
-RUN npm ci --omit=dev && \
+RUN npm install --omit=dev && \
     npm rebuild better-sqlite3 && \
     npm cache clean --force