feat(exe)!: require Node >=25.7 and default format to esm

[sxzz]

Summary

Raise the minimum Node.js version for exe from >=25.5.0 to >=25.7.0, and always default to ESM format (removing the CJS fallback for older versions).

Motivation

Node.js SEA (Single Executable Applications) introduced an incompatible format change between v25.6.x and v25.7.0. Executables built with one side of this boundary cannot run on the other:

Build \ Target	25.5.0	25.6.0	25.6.1	25.7.0	25.8.0
25.5.0	✅	✅	✅	❌ assert(134)	❌ assert(134)
25.6.1	✅	✅	✅	❌ assert(134)	❌ assert(134)
25.7.0	❌ segfault(139)	❌ segfault(139)	❌ segfault(139)	✅	✅
25.8.0	❌ segfault(139)	❌ segfault(139)	❌ segfault(139)	✅	✅

The cross-boundary failure is caused by a SeaDeserializer::Read() assertion at node_sea.cc:171: format_value <= static_cast<uint8_t>(ModuleFormat::kModule).

Since @tsdown/exe already requires >=25.7.0 for downloading Node binaries (SEA_VERSION_RANGE), aligning the build-time check avoids a confusing gap where tsdown --exe would appear to succeed on 25.5/25.6 but produce binaries incompatible with the downloaded target.

With 25.7.0 as the minimum, ESM SEA is always supported, so the conditional CJS fallback is no longer needed.

Changes

• src/features/exe.ts: validateSea() now checks >=25.7.0
• src/config/options.ts: Remove conditional CJS default when exe is enabled (let → const, always esm)
• src/config/types.ts: Update JSDoc for format and exe options
• docs/options/exe.md, docs/reference/cli.md: Update requirements and behavior
• docs/zh-CN/options/exe.md, docs/zh-CN/reference/cli.md: Chinese docs sync

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