docs: README file-map for v2.0-only layout (apis/ + components/)

tmforum: reduce to v2.0 allowed payload only (111 docs); remove 1.0-derived content

docs: short README (structure overview + file-map)

tmforum-v2: add 5 new API specs (TMF639/642/672/677/767), refresh 13 ODA components, drop 217 superseded versions (curated-latest)

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initial commit