Add text2vec-digitalocean vectorizer module

[mpartipilo]

Summary

Adds support for the new text2vec-digitalocean vectorizer module exposed by Weaviate server. The shape mirrors text2vec-mistral (model + baseURL + vectorizeClassName), so the existing serialization path and Pydantic URL normalization are reused unchanged.

Following review, only the supported Configure.Vectors API surface is extended (matching the precedent set by text2vec-morph and other recent additions). Configure.Vectorizer and Configure.NamedVectors are not touched — they're the deprecated paths.

API surface added

• Vectorizers.TEXT2VEC_DIGITALOCEAN enum entry
• _Text2VecDigitalOceanConfig Pydantic config class
• Configure.Vectors.text2vec_digitalocean(name=..., model=..., ...) — the only factory entry point

Parameters

Python (snake_case)	Wire (camelCase)	Required	Default
model	model	yes (server requires it; client enforces too)	none
base_url	baseURL	no	server default https://inference.do-ai.run
vectorize_collection_name	vectorizeClassName	no	True

Test plan

• Unit test added to test/collection/test_config.py (in TEST_CONFIG_WITH_VECTORS_PARAMETERS) asserting wire-format serialization, including the trailing-slash URL normalization Pydantic AnyHttpUrl applies
• pytest test/collection/test_config.py — 185 pass
• ruff check + ruff format --check clean on all 4 changed files
• Runtime smoke-test via REPL: factory produces the expected wire payload; calling without model= raises TypeError from Pydantic

Review-feedback changes

Second commit (22aa8fce) addresses @dirkkul's review:

• Make model required on the Pydantic class and on the factory parameter
• Remove the Configure.Vectorizer.text2vec_digitalocean factory (deprecated API surface; not extended for new modules)
• Remove the Configure.NamedVectors.text2vec_digitalocean factory (same reason)
• Drop the now-orphan _Text2VecDigitalOceanConfig import from config_named_vectors.py
• Remove the two corresponding test cases; update the Vectors test to pass the required model

Closes #2038

Sibling PRs (same feature, fanned out across SDKs):

• TypeScript: Add support for text2vec-digitalocean module typescript-client#430
• Java: Add support for text2vec-digitalocean module java-client#569
• Go: Add support for text2vec-digitalocean module weaviate-go-client#401
• C#: Add support for text2vec-digitalocean module csharp-client#339

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[orca-security-eu]

Orca Security Scan Summary

Status	Check	Issues by priority
Passed	Infrastructure as Code	0   0   0   0	View in Orca
Passed	SAST	0   0   0   0	View in Orca
Passed	Secrets	0   0   0   0	View in Orca
Passed	Vulnerabilities	0   0   0   0	View in Orca

[codecov-commenter]

Codecov Report

❌ Patch coverage is 92.85714% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 86.72%. Comparing base (78fa5f7) to head (22aa8fc).
⚠️ Report is 163 commits behind head on main.

Files with missing lines	Patch %	Lines
weaviate/collections/classes/config_vectorizers.py	90.90%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2041      +/-   ##
==========================================
- Coverage   87.95%   86.72%   -1.23%     
==========================================
  Files         280      299      +19     
  Lines       21664    22928    +1264     
==========================================
+ Hits        19054    19884     +830     
- Misses       2610     3044     +434     

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