Update f90wrap path for libneo vmec_support decomposition

[krystophny]

Risk tier

• T0: docs, comments, small build metadata
• T1: pure refactor, no behavior change intended
• T2: local numerical logic
• T3: physics, output behavior, coordinate convention
• T4: parallelism, GPU, dependency, CI, or security-sensitive build logic

Correctness contract

Intended behavior change

Update the f90wrap source path for canonical_coordinates_mod.f90 to the decomposed libneo VMEC-support layout: src/vmec_support/canonical_coordinates_mod.f90.

Behavior that must not change

SIMPLE Python wrapping should still include the same canonical-coordinate module when built against the matching decomposed libneo branch.

Coordinate / unit conventions

Unchanged.

Numerical invariants

Unchanged. This is a dependency-layout change only.

Tests added

• unit: none
• integration: existing build should validate against matching libneo branch
• system: none
• golden record: unchanged

Golden-record impact

• unchanged
• changed

Failure modes considered

• Building against old libneo fails because the moved file path does not exist.
• Building against decomposed libneo should find the new path.
• This PR should stay draft until the matching libneo branch/tag is selected in CI.

Manual validation

Local rebase succeeded. Local build against the current local libneo checkout failed as expected for this draft because that checkout does not contain the decomposed src/vmec_support path.

Verification

make test-nopy TEST=test_boozer_chartmap VERBOSE=1
...
ninja: error: '/home/ert/code/libneo/src/vmec_support/canonical_coordinates_mod.f90', needed by 'python/canonical_coordinates_mod.f90.i', missing and no known rule to make it
make: *** [Makefile:71: build-deterministic] Error 1