1462 Add ScalarType to Code examples in the documentation

[annawendler]

Changes and Information

Please briefly list the changes (main added features, changed items, or corrected bugs) made:

• Adjust code examples regarding changes of floating point template parameter
• Update documentation for installing Python packages

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Closes #1462

[Copilot]

Pull request overview

This PR updates C++ documentation (and one example) to use ScalarType consistently in code examples after the floating-point template parameter changes introduced in #1018, addressing issue #1462.

Changes:

• Replace hard-coded double template arguments/usages in many model documentation snippets with ScalarType.
• Align selected model-/parameter-template usages in documentation with the current templated APIs.
• Update cpp/examples/ode_secirvvs.cpp to use ScalarType and Model<ScalarType>.

Reviewed changes

Copilot reviewed 14 out of 14 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
docs/source/cpp/models/osir.rst	Update simulation/time-series examples to use ScalarType.
docs/source/cpp/models/oseirv.rst	Switch model instantiation and time-related variables to ScalarType.
docs/source/cpp/models/oseirdb.rst	Update contact pattern and simulation snippets to ScalarType.
docs/source/cpp/models/oseir.rst	Update contact pattern and simulation snippets to ScalarType.
docs/source/cpp/models/osecirvvs.rst	Update vaccination/contact/NPI/simulation examples to ScalarType.
docs/source/cpp/models/osecirts.rst	Update contact/NPI/simulation examples to ScalarType.
docs/source/cpp/models/osecir.rst	Update contact pattern and simulation snippets to ScalarType.
docs/source/cpp/models/omseirs4.rst	Update simulation time variables to ScalarType.
docs/source/cpp/models/lsecir2d.rst	Update LCT-SECIR-2D type definitions and examples to use ScalarType.
docs/source/cpp/models/lsecir.rst	Update LCT-SECIR type definitions and examples to use ScalarType.
docs/source/cpp/models/iseir.rst	Update IDE-SEIR initialization snippets to use ScalarType.
docs/source/cpp/models/isecir.rst	Update IDE-SECIR flows/contact/output snippets to use ScalarType.
docs/source/cpp/models/glsecir.rst	Update GLCT-SECIR type/parameter examples to use ScalarType.
cpp/examples/ode_secirvvs.cpp	Switch example simulation parameters and model template arg to ScalarType.

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[kilianvolmer]

Great, we can merge this as soon as the CI ran through.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.42%. Comparing base (33c572a) to head (30f044e).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1546      +/-   ##
==========================================
- Coverage   97.45%   97.42%   -0.04%     
==========================================
  Files         190      190              
  Lines       15963    15966       +3     
==========================================
- Hits        15557    15555       -2     
- Misses        406      411       +5     

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