Update documentation and add KDoc to public APIs

[linroid]

Summary

• CLAUDE.md: Complete rewrite to reflect the api+core+remote module architecture, updated package structure, new features (queue management, scheduling, speed limits, download sources, daemon server, remote backend), corrected platform limitations (WasmJs FileAccessor stub, iOS targets, SQLite no WasmJs)
• README.md: Comprehensive update with corrected badges (Kotlin 2.3.10, Android 26+), modern code examples, full module table with published SDK clarification, platform support matrix (WasmJs "Remote only" footnote), daemon server section, and all new feature documentation
• KDoc: Added comprehensive documentation to 10 public API files across api, core, and ktor modules (DownloadState, DownloadProgress, KDownError, Segment, KDownVersion, DownloadTask methods, HttpEngine, ServerInfo, FileAccessor, KtorHttpEngine)

Files changed (12)

• .claude/CLAUDE.md — Full rewrite
• README.md — Full rewrite
• library/api/ — KDoc added to 6 files (DownloadState, DownloadProgress, KDownError, Segment, KDownVersion, DownloadTask)
• library/core/ — KDoc added to 3 files (HttpEngine, ServerInfo, FileAccessor)
• library/ktor/ — KDoc added to KtorHttpEngine

Test plan

• ./gradlew :library:api:compileKotlinJvm :library:core:compileKotlinJvm :library:ktor:compileKotlinJvm passes
• All code examples in README verified against actual API signatures
• Cross-reference consistency checked between README.md, CLAUDE.md, and LOGGING.md
• Platform support claims verified against build files

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