fix(http): replace temp paths with upload ids

[qin-ctx]

Description

Replace HTTP temp upload path exposure with opaque temp_file_id values and update clients, tests, and docs to use the new upload flow.

Related Issue

Fixes #1013

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Refactoring (no functional changes)
• Performance improvement
• Test update

Changes Made

• replace HTTP temp_path usage with temp_file_id so temp uploads no longer expose host filesystem paths
• tighten server-side validation for uploaded temp files and reject legacy direct-path patterns in resources, skills, and pack import APIs
• update Python/Rust clients, console flow, tests, and bilingual docs, including raw HTTP guidance for zipped directory uploads

Testing

• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have tested this on the following platforms:
  • Linux
  • macOS
  • Windows

Checklist

• My code follows the project's coding style
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published

Screenshots (if applicable)

Additional Notes

• Local verification:
  • .venv/bin/python -m pytest tests/server/test_api_resources.py tests/server/test_api_local_input_security.py tests/server/test_api_relations.py tests/client/test_http_client_local_upload.py -q
  • .venv/bin/python -m pytest tests/server/test_http_client_sdk.py tests/server/test_error_scenarios.py -q
  • cargo check -p ov_cli

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