[codex] add plugin base image deployment acceleration

[dengyh]

Summary

• Add a reusable plugin Python base image Dockerfile and BK-CI build guidance.
• Add cookiecutter template Docker support with a fixed base image tag and custom_requirements.txt for incremental dependencies.
• Add static tests for base image/template contracts and framework-version-to-image-tag consistency.

Validation

• python -m pytest bk-plugin-framework/tests/template/test_docker_template.py -q
• docker build -f docker/base/Dockerfile -t bk-plugin-python-base:2.3.14 .
• docker run --rm bk-plugin-python-base:2.3.14 python -c "import bk_plugin_framework, bk_plugin_runtime"
• cookiecutter render check: skipped locally because cookiecutter is not installed.

Notes

• Base image tag follows the bk-plugin-framework version, e.g. bk-plugin-python-base:2.3.14.
• Docker-based plugin custom dependencies should go in custom_requirements.txt; requirements.txt remains the default dependency source for non-Docker flows and the base image build.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (master@ae19568). Learn more about missing BASE report.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #131   +/-   ##
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  Coverage          ?   91.59%           
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  Files             ?       39           
  Lines             ?     1428           
  Branches          ?        0           
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  Hits              ?     1308           
  Misses            ?      120           
  Partials          ?        0           

Files with missing lines	Coverage Δ
...n-framework/tests/template/test_docker_template.py	100.00% <100.00%> (ø)

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