feat: Add single-container package image

[junhaoliao]

Description

Adds a single-container package image build path for local validation and demo deployments:

• adds task package-single-image, docker-images:package-single, and tools/deployment/package/build-single-image.sh.
• adds tools/deployment/package/Dockerfile.single and run-single-container.sh.
• runs MariaDB, RabbitMQ, Redis, MongoDB, CLP workers/schedulers, API server, log ingestor, reducer, and WebUI under supervisord.
• keeps startup close to the existing Docker Compose flow: MariaDB/RabbitMQ/Redis/Mongo use the same env/config shape where possible, CLP DB/schema creation uses python3 -m clp_py_utils.create-db-tables, and results-cache setup uses python3 -m clp_py_utils.initialize-results-cache.
• removes the custom post-start MariaDB/RabbitMQ init scripts; Redis has no init step, matching Compose.

The only remaining entrypoint DB bootstrap is the minimum first-run MariaDB database/user setup that the upstream MariaDB container entrypoint normally performs before the CLP Python DB initialization modules can connect.

Checklist

• The PR satisfies the contribution guidelines.
• This is a breaking change and that has been indicated in the PR title, OR this isn't a breaking change.
• Necessary docs have been updated, OR no docs need to be updated.

Validation performed

• bash -n tools/deployment/package/single-container/entrypoint.sh tools/deployment/package/single-container/wait-for-files.sh tools/deployment/package/single-container/wait-for-tcp.sh tools/deployment/package/build-single-image.sh tools/deployment/package/run-single-container.sh tools/docker-images/clp-package/build.sh
• git diff --check
• Parsed tools/deployment/package/single-container/supervisord.conf with Python configparser.
• Built clp-package-single:latest with tools/deployment/package/build-single-image.sh.
• Launched a fresh single-container deployment using the image and a bind-mounted package config plus ~/samples/big mounted at /mnt/logs.
• Verified supervisorctl status: all long-running services were RUNNING; db-table-creator and results-cache-indices-creator exited successfully.
• Verified API/WebUI health: GET /health returned API server is running; WebUI returned HTTP 200.
• Verified backing services: MariaDB CLP table present, RabbitMQ authenticate_user clp-user pass succeeded, Redis PING returned PONG.
• Compressed /spark-event-logs-1 through the WebUI/API flow into dataset spark_validation3: compression job 3 completed with 8/8 tasks, 2,126,027,157 uncompressed bytes and 37,785,117 compressed bytes.
• Searched the compressed dataset through the WebUI: SparkListenerLogStart returned 6,512 results and SparkListenerTaskEnd returned 293,947 results.

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