Fix Dockerfile and k8s manifest for deployment

- Simplify Dockerfile: use pre-built cross-compiled binary instead of
  building in Alpine (Alpine only has Zig 0.13, we need 0.15)
- Fix image URL in k8s manifest: git.mikhailkilin.ru (not gitea.)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Dockerfile

@@ -1,10 +1,4 @@
-FROM alpine:3.21 AS builder
-RUN apk add --no-cache zig
-COPY . /app
-WORKDIR /app
-RUN zig build -Doptimize=ReleaseSafe
-
 FROM alpine:3.21
 RUN apk add --no-cache ffmpeg ca-certificates
-COPY --from=builder /app/zig-out/bin/transcribator /usr/local/bin/
+COPY zig-out/bin/transcribator /usr/local/bin/
 CMD ["transcribator"]