Support independent rotation axis binding

[rsdadada]

Summary

• split model rotation binding into independent pitch, yaw, and roll controls
• add a continuous Y-X-Z Euler lift for partial-axis binding
• preserve the exact existing behavior when all rotation axes are bound or all are unbound
• migrate legacy JSON and binary configs while retaining codec 703 reads
• add localized UI tooltips and narration

Motivation

As discussed in #17, one rotation matrix can have multiple equivalent Euler representations. That ambiguity is harmless while applying all three components, but it becomes visible when components are selected independently.

This PR defines an explicit policy for partial binding: evaluate both equivalent Y-X-Z branches, unwrap them against the previous frame, and choose the nearest branch. At ±90° pitch, the previous frame fixes the otherwise unobservable yaw/roll split. After a lifecycle reset, vanilla camera orientation is used as the initial reference.

This implements the independent-axis alternative mentioned in #64. It does not claim to recover separate head and body transforms from one flattened model matrix.

Compatibility

• mask 000: returns vanilla pitch/yaw/roll exactly
• mask 111: returns the previous principal Euler extraction exactly
• legacy JSON bindRotation maps to all three new flags
• new JSON also writes a conservative legacy flag using pitch && yaw && roll
• binary codec 704 stores all six position/rotation flags; codec 703 remains readable
• the legacy four-boolean BindConfig constructor and bindRotation() accessor remain available
• rotation offsets keep their existing local rigid-transform semantics

The public record now has six components, so consumers reflecting over record components will observe the expanded shape.

Validation

• .\gradlew.bat clean build --no-daemon
• Fabric and NeoForge artifacts built successfully
• Fabric client loaded RealCamera 0.7.9-beta through GUI atlas creation with no RealCamera/Mixin injection errors

Related to #17 and #64.