Note

Modernizes how inverted-index terms are stored and accessed.

• Replaces keysDict entries from RedisModuleString/KeysDictValue to dict<CharBuf, InvertedIndex*> with custom hash/dup/compare/destructors; updates missingFieldDict val destructor
• Adds CharBuf type and invIdxDictType; switches term access/deletion to stack CharBuf (no Redis strings)
• Changes Redis_OpenInvertedIndex (write flag now bool) and Redis_OpenReader APIs to accept RSToken and create RSQueryTerm internally; updates all call sites in query.c
• Fork GC: uses CharBuf keys for dictDelete, removes string frees, preserves stats updates
• Renames key-format and drop-scan helpers to legacy: Legacy_fmtRedis{Term,SkipIndex,ScoreIndex}Key, Redis_LegacyDropScanHandler; updates usages in spec.c
• Minor comment cleanups in field spec info

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