feat: license unification + TLV->ILV rename + WASM real SPZ test

[gugu23456789]

Summary

This PR includes three groups of changes:

1. License Unification (MulanPSL-2.0)

• Changed all @license MIT to @license MulanPSL-2.0 across all source files
• Removed full MIT license text from report.h
• Aligns with existing SPDX-License-Identifier headers (MulanPSL-2.0)

2. TLV -> ILV Naming (Indexed-Length-Value)

• Renamed all TLV references to ILV in comments, error messages, and help text
• Code was already using ILV naming (IlvRecord, ilv.h, etc.) - only docs/comments were outdated
• Updated CLI help output and guide text

3. WASM CI Test Enhancement

• Added real SPZ file testing using classroom_anime dataset from tests/fixtures/
• Tests inspectSpz, dumpTrailer, listRegisteredExtensions, getCompatibilityBoard APIs
• Tests UI panel rendering (no n/a in summary/extensions/trailer panels)
• Covers both SPZ v3 and v4 formats, both synthetic and real files
• 4 test files: synthetic_v3, synthetic_v4, real_classroom_anime_v3, real_classroom_anime_v4

4. Bug Fixes

• createUnavailableMethod: returns Promise.reject() instead of sync throw
• Fallback methods: return Promise.resolve() for consistency

Files Changed

• 21 files modified, ~200 insertions, ~120 deletions
• +2 binary fixtures: tests/fixtures/classroom_anime_v3.spz, classroom_anime_v4.spz

Test Plan

• All CI checks pass (build + test on all platforms)
• WASM smoke test passes (bundle audit + real SPZ file tests)
• C++ unit tests pass