refactor(jit): silence Ionic CCQE probe logs and clean up caching

[jhchouuu]

Summary

• Migrate Ionic CCQE detection messages from unconditional print to the logging module. They were printing on every import mori and cluttering CI / user output. JIT compilation progress lines ([mori-jit] Compiling ..., [mori-jit] Cached: ...) are intentionally kept as print and remain visible by default.
• Replace the _ccqe_enabled module-global + None-sentinel cache in is_ccqe_enabled() with @functools.cache. This gives us thread-safe single-execution semantics for free, removes the global statement, and exposes is_ccqe_enabled.cache_clear() for tests.
• Make MORI_DISABLE_IONIC_CCQE parsing case-insensitive and accept 1 / true / on / yes, matching the conventions used by ENABLE_PROFILER and MORI_DEBUG_INFO elsewhere in mori python (and IsEnvVarEnabled on the C++ side).

Behavior change

Default behavior for end users:

Log line	Before	After
Ionic _ccqe_enabled: ... lib_support ... nic_support: ...	always printed	silent (visible at INFO level)
ionic ver: <N>	always printed	silent (visible at DEBUG level)
[mori-jit] Compiling ... / Cached: ...	printed	unchanged, still printed

To re-enable the Ionic diagnostic line, an application can do:

import logging
logging.getLogger("mori").setLevel(logging.INFO)
logging.basicConfig()

Test plan

• import mori no longer emits the Ionic _ccqe_enabled: ... line
• MORI_PRECOMPILE=1 python -c 'import mori' still shows [mori-jit] Compiling ... / Cached: ... lines
• MORI_DISABLE_IONIC_CCQE=true / =on / =yes / =1 all disable CCQE
• Existing CI green

[Copilot]

Pull request overview

This PR reduces noisy stdout output during import mori by moving Ionic CCQE probing messages to the Python logging framework, while keeping intentional JIT progress output as print. It also simplifies CCQE enablement caching by switching from a module-global sentinel to functools.cache.

Changes:

• Replace unconditional print diagnostics for Ionic CCQE probing with logger.info / logger.debug.
• Refactor is_ccqe_enabled() caching to use @functools.cache instead of a module-global None sentinel.
• Make MORI_DISABLE_IONIC_CCQE parsing case-insensitive and accept multiple truthy values (1/true/on/yes).

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