Add emotes HTML page at /, health endpoint, Dockerfile, and Docker workflow

Dockerfile

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+FROM rust:1.85-bookworm AS builder
+
+WORKDIR /app
+
+# Copy manifests first for better layer caching
+COPY Cargo.toml Cargo.lock ./
+
+# Create a dummy main to cache dependency compilation
+RUN mkdir src && echo "fn main() {}" > src/main.rs && \
+    mkdir migrations && touch migrations/.keep && \
+    echo "fn main() {}" > build.rs && \
+    cargo build --release && \
+    rm -rf src build.rs migrations
+
+# Copy real source code
+COPY . .
+
+# Touch main.rs so cargo knows it changed
+RUN touch src/main.rs && cargo build --release
+
+# Runtime stage
+FROM debian:bookworm-slim
+
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends ca-certificates && \
+    rm -rf /var/lib/apt/lists/*
+
+COPY --from=builder /app/target/release/mikebase /usr/local/bin/mikebase
+COPY --from=builder /app/config.example.toml /etc/mikebase/config.example.toml
+
+EXPOSE 3000
+
+CMD ["mikebase"]