refactor: split jobs_view, drop YAML migration, update docs (T6.1-T6.4)
T6.1: split jobs_view.go into three files — jobs_view_helpers.go (pure helpers) and jobs_view_details.go (detailsPanel struct with widget creation, update, clear, and container methods) — bringing jobs_view.go from 459 to ~200 lines. T6.2: remove stale YAML upgrade note from README; drop *.yaml from .dockerignore. T6.3: delete YAML shadow structs (yamlConfig/yamlJob/yamlJobsFile), importYAMLConfig/importYAMLJobs, legacy path constants, and all YAML-import tests; run go mod tidy to remove go.yaml.in/yaml/v4. T6.4: refresh ARCHITECTURE.md — JSON storage references, new Key Domain Concepts section (per-job overlap policy, run-time statistics + log seeding, persisted pause flag, jobs_view split). Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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