feat: add Dockerfile and docker-compose for containerized deployment

Dockerfile

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+FROM golang:1.26.4-alpine AS builder
+
+WORKDIR /app
+COPY go.mod go.sum ./
+RUN go mod download
+COPY . .
+RUN CGO_ENABLED=0 go build -o /divad ./cmd/divad
+
+FROM gcr.io/distroless/static-debian13:nonroot
+COPY --from=builder /divad /divad
+EXPOSE 8080
+ENTRYPOINT ["/divad"]

docker-compose.yml

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+services:
+  divacode:
+    build: .
+    container_name: divacode-agent
+    restart: unless-stopped
+    ports:
+      - "8081:8080"
+    environment:
+      LLAMACPP_URL: ${LLAMACPP_URL:-http://host.docker.internal:8080}
+      DB_PATH: /data/divacode.db
+      COMPANION_DB_PATH: /data/companion.db
+      SYSTEM_PROMPT: ${SYSTEM_PROMPT:-You are Diva, a curious and thoughtful AI companion.}
+      LOG_LEVEL: ${LOG_LEVEL:-INFO}
+      TEMPERATURE: ${TEMPERATURE:-0.85}
+      TOP_P: ${TOP_P:-0.9}
+      MAX_TOKENS: ${MAX_TOKENS:-2048}
+      CONTEXT_SIZE: ${CONTEXT_SIZE:-8192}
+      API_ENABLED: "true"
+      API_PORT: "8080"
+      SCHEDULER_INTERVAL: ${SCHEDULER_INTERVAL:-15m}
+      AUTO_DIARY: ${AUTO_DIARY:-true}
+      DIARY_HOUR: ${DIARY_HOUR:-23}
+    volumes:
+      - divacode-data:/data
+
+volumes:
+  divacode-data: