docs: refresh bilingual READMEs and product showcase assets #6077

Job	Run time
Shell Deploy Scripts	23s
Build Impact	14s
Frontend Build	2m 46s
Rust / CLI Validation	8s
CLI Tests (${{ matrix.os }})	0s
DSH Profile Packaging (windows-latest)	0s
Impact-selected Linux / Relay Contract	0s
Rust Build Check (${{ matrix.os }})	0s
	3m 31s

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