Support HF_HOME and HF_ENDPOINT

[DayNice]

Changed constructor calls for hf_hub::api::sync::ApiBuilder from ApiBuilder::new into ApiBuilder::from_env. Affected files are as follows.

rust/src/embeddings/local
├── bert.rs
├── clip.rs
├── jina.rs
├── modernbert.rs
└── qwen3.rs

Checked that the following tests succeed.

Python tests

pytest -x tests/model_tests/test_bert.py \
  tests/model_tests/test_clip.py \
  tests/model_tests/test_jina.py

Rust tests

cargo test embeddings::local::bert \
&& cargo test embeddings::local::jina \
&& cargo test embeddings::local::modernbert  \
&& cargo test embeddings::local::qwen3

Note that the following test for clip was already failing before this change was introduced.

cargo test embeddings::local::clip
#    Compiling embed_anything v0.6.5 (/home/daynice/repo/EmbedAnything/rust)
#     Finished `test` profile [unoptimized + debuginfo] target(s) in 1.53s
#      Running unittests src/lib.rs (/home/daynice/repo/EmbedAnything/target/debug/deps/embed_anything-9357e31b730d5ea8)

# running 4 tests
# test embeddings::local::clip::tests::test_tokenize_sequences ... FAILED
# test embeddings::local::clip::tests::test_load_images ... ok
# test embeddings::local::clip::tests::test_load_image ... ok
# test embeddings::local::clip::tests::test_embed_image_batch ... ok
# 
# failures:
# 
# ---- embeddings::local::clip::tests::test_tokenize_sequences stdout ----
# 
# thread 'embeddings::local::clip::tests::test_tokenize_sequences' panicked at rust/src/embeddings/local/clip.rs:375:9:
# assertion `left == right` failed
#   left: [2, 77]
#  right: [2, 8]
# note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
# 
# 
# failures:
#     embeddings::local::clip::tests::test_tokenize_sequences
# 
# test result: FAILED. 3 passed; 1 failed; 0 ignored; 0 measured; 17 filtered out; finished in 9.69s
# 
# error: test failed, to rerun pass `--lib`

Closes #178

[DayNice]

Checked that HF_HOME now works.

export HF_HOME=/tmp/hf_home

hf cache scan
# Cache directory not found: /tmp/hf_home/hub

# trigger local caching
cargo test embeddings::local::bert

hf cache scan
# REPO ID                                REPO TYPE SIZE ON DISK NB FILES LAST_ACCESSED  LAST_MODIFIED  REFS LOCAL PATH
# -------------------------------------- --------- ------------ -------- -------------- -------------- ---- ----------------------------------------------------------------
# sentence-transformers/all-MiniLM-L6-v2 model            91.3M        3 33 seconds ago 33 seconds ago main /tmp/hf_home/hub/models--sentence-transformers--all-MiniLM-L6-v2
# 
# Done in 0.0s. Scanned 1 repo(s) for a total of 91.3M.

[akshayballal95]

Works perfect! Fixed the issue with the test as well. Thanks for the contribution!