Fix typos, wrong paths, and copy-pasted GE tag references in Siemens code

[Devguru-codes]

Locations

Sub-Issue	File	Line(s)
Siemens manufacturer typo	siemens_base.py:17	"SIEMENS HEALHINEERS" → "SIEMENS HEALTHINEERS"
Enum filename typo	enums/modaliy_enum.py	File renamed to modality_enum.py
Wrong test URL path	tests/test_report.py:26	/report/process/dicom → /api/report/process/dicom
Siemens base uses GE tags	siemens_base.py:20-55	Replaced GE_* tags with SIEMENS_* tags
Siemens PLD uses GE tags	siemens_basic_single_pld.py:18-21	Replaced GE_* tag references with local SIEMENS_* constants

Description

Multiple typos, wrong paths, and copy-paste naming issues across the codebase. The most critical: the Siemens sequence classes used GE-specific DICOM tag names and references, including a comment saying "Direct GE-specific mappings" in Siemens code. The test file used a wrong URL path (missing /api prefix) causing it to always get a 404.

Reproduction (on main branch)

Buggy Code

Sub1: Siemens typo

# siemens_base.py:17
return "SIEMENS" in manufacturer or "SIEMENS HEALTHCARE" in manufacturer or "SIEMENS HEALHINEERS" in manufacturer
#                                                                                   ^^^^^^^^^^^^ typo

Sub2: Enum filename

enums/modaliy_enum.py   # missing 't' → should be modality_enum.py

Sub3: Wrong test URL

# test_report.py:26
response = client.post("/report/process/dicom", ...)  # Missing /api prefix!

Sub4-5: GE tags in Siemens code

# siemens_base.py:23-24
# Direct GE-specific mappings        <-- Comment says GE!
if dcm_tags.GE_ASSET_R_FACTOR in d:  <-- GE tag in Siemens code!

Automated Results on main branch

#	Test	Status	Detail
1	Siemens manufacturer string correctly spelled	FAIL	Contains typo "HEALHINEERS"
2	Enum file named modality_enum.py	FAIL	Named modaliy_enum.py
3	Test uses correct URL /api/report/process/dicom	FAIL	Missing /api prefix
4	siemens_base.py no GE-specific tags	FAIL	Contains GE_ASSET_R_FACTOR, GE_EFFECTIVE_ECHO_SPACING
5	siemens_basic_single_pld.py no GE tags	FAIL	Uses GE_LABEL_DURATION, GE_INVERSION_TIME

Summary: PASSED=0 FAILED=5

Working on this issue.