fix: Demo fixes and OCR to Ingestion renaming

[rmitsch]

Description

This PR includes various demo fixes and renames OCR to Ingestion to better reflect the task's purpose. The changes improve documentation consistency and add a demo file for PyData Amsterdam 2025.

Related Issues

-

Changes Made

• Renamed OCR to Ingestion throughout the codebase to better reflect task role
• Added demo.py file for PyData Amsterdam 2025
• Fixed package name in setup.py (spacy-llm -> sieves)
• Improved Outlines engine batch processing with fallback for unimplemented batch methods
• Updated documentation and examples to use Ingestion instead of OCR
• Fixed typing annotations by removing TypeAlias usage for Python 3.9 compatibility
• General code cleanup and formatting improvements

Checklist

• Tests have been extended to cover changes in functionality
• Existing and new tests succeed
• Documentation updated (if applicable)
• Related issues linked

[codecov]

Codecov Report

❌ Patch coverage is 89.47368% with 4 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
sieves/engines/outlines_.py	66.66%	3 Missing ⚠️
...es/tasks/predictive/information_extraction/core.py	90.90%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #156      +/-   ##
==========================================
+ Coverage   91.16%   91.20%   +0.04%     
==========================================
  Files          44       44              
  Lines        3056     3071      +15     
==========================================
+ Hits         2786     2801      +15     
  Misses        270      270              

Files with missing lines	Coverage Δ
sieves/pipeline/core.py	94.11% <ø> (ø)
sieves/tasks/predictive/classification/core.py	94.07% <100.00%> (+0.28%)	⬆️
sieves/tasks/preprocessing/ingestion/core.py	92.85% <100.00%> (ø)
sieves/tasks/preprocessing/ingestion/docling_.py	79.16% <ø> (ø)
sieves/tasks/preprocessing/ingestion/marker_.py	32.07% <ø> (ø)
...ves/tasks/preprocessing/ingestion/unstructured_.py	92.59% <ø> (ø)
...es/tasks/predictive/information_extraction/core.py	93.10% <90.90%> (+0.65%)	⬆️
sieves/engines/outlines_.py	87.80% <66.66%> (-4.31%)	⬇️

... and 2 files with indirect coverage changes

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