fix: lazy load settings service; fix env init order

[jordanrfrazier]

Enforces that the setting service is not initialized before the env file is loaded.

This ensures that we aren't loading the settings without picking up the correct environment variables, even if the user sets a custom env file path.

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[HimavarshaVS]

lgtm

[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 32 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (release-1.6.4@6ee3d50). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
...rc/backend/base/langflow/api/v1/knowledge_bases.py	15.38%	11 Missing ⚠️
...e/langflow/components/knowledge_bases/ingestion.py	50.00%	6 Missing ⚠️
...e/langflow/components/knowledge_bases/retrieval.py	45.45%	6 Missing ⚠️
src/backend/base/langflow/__main__.py	25.00%	3 Missing ⚠️
src/backend/base/langflow/api/v1/mcp_projects.py	0.00%	2 Missing ⚠️
src/backend/base/langflow/base/mcp/util.py	86.66%	2 Missing ⚠️
src/backend/base/langflow/graph/edge/base.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff                @@
##             release-1.6.4   #10142   +/-   ##
================================================
  Coverage                 ?   35.84%           
================================================
  Files                    ?     1220           
  Lines                    ?    58229           
  Branches                 ?     5530           
================================================
  Hits                     ?    20873           
  Misses                   ?    37195           
  Partials                 ?      161           

Flag	Coverage Δ
backend	55.78% <50.00%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...se/langflow/components/input_output/chat_output.py	88.31% <100.00%> (ø)
src/backend/base/langflow/schema/dataframe.py	91.48% <100.00%> (ø)
src/backend/base/langflow/services/deps.py	91.30% <100.00%> (ø)
src/backend/base/langflow/api/v1/mcp_projects.py	24.11% <0.00%> (ø)
src/backend/base/langflow/base/mcp/util.py	57.00% <86.66%> (ø)
src/backend/base/langflow/graph/edge/base.py	51.97% <0.00%> (ø)
src/backend/base/langflow/__main__.py	54.50% <25.00%> (ø)
...e/langflow/components/knowledge_bases/ingestion.py	74.91% <50.00%> (ø)
...e/langflow/components/knowledge_bases/retrieval.py	73.22% <45.45%> (ø)
...rc/backend/base/langflow/api/v1/knowledge_bases.py	16.34% <15.38%> (ø)

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud