refactor(api)!: drop the inert globals

[andiwand]

🤖 Generated with Claude Code

PR 2 of the v7 API plan.

docs/design/README.md has carried this as an open task for a while, with the
reason it was still open written into it: "Removing them is the breaking change
this deliberately is not." A major is when it becomes one.

What was inert, and since when

GlobalParams stored two strings and read neither back:

• odr_core_data_path — where the renderer's css and js used to be read from.
  They are compiled into the library now.
• libmagic_database_path — the magic.mgc every consumer had to ship and
  point us at. Detection is our own, and it reads inside zip and cfb
  containers, which libmagic could not.

Both accessors were kept so a caller that configured them kept compiling. Same
for ODR_WITH_LIBMAGIC and ODR_BUNDLE_ASSETS, which by then did nothing but
print a message(DEPRECATION).

What goes

C++	odr/global_params.hpp, global_params.cpp
JNI	GlobalParams.java, four Java_..._GlobalParams_* entry points
Python	pyodr.GlobalParams
ObjC	ODRGlobalParams incl. bootstrapFromFrameworkBundle
Android	OdrAndroid and its no-op init(context)
Build	ODR_WITH_LIBMAGIC, ODR_BUNDLE_ASSETS, conan with_libmagic, bundle_assets

Net −327/+23.

HtmlConfig::embed_shipped_resources, resource_path,
relative_resource_paths and HtmlResource::is_shipped are not touched —
those decide where the compiled-in css and js land, which is a live question.
What died is the idea of finding a data directory.

Notes

• Deleting OdrAndroid empties android/src/main/java; the module's sources
  come from ../jni/java via sourceSets, so nothing else changes.
• OdrAndroidTest loses its initIsANoOp case and is renamed AarContractTest
  — it now only checks what it was always really about, that the AAR works with
  no setup.

Verified

Library, CLI, JNI + java jar, python module and odr_test all build; the 68
python tests pass. Apple and wasm are deletions only, with no remaining
reference to ODRGlobalParams anywhere in the tree.

Migration

Delete the calls. Nothing replaces them — that is the point.