fix: resolve aggregate column names for chart sorting

[sentry]

This PR addresses a ProgrammingError: (psycopg2.errors.UndefinedColumn) that occurred when sorting charts by aggregated metrics.

Problem:
When the frontend sent a sort column name as an aggregation expression (e.g., AVG(total_revenue)), the backend's apply_chart_sorting function failed to resolve it to the correct SQL alias (e.g., A) defined in the SELECT clause. This happened because apply_chart_sorting only checked against metric.alias and not the aggregation expression itself. Consequently, the raw AVG(total_revenue) string was passed to the query builder, which then generated an ORDER BY "AVG(total_revenue)" clause. PostgreSQL rejected this as an undefined column because "AVG(total_revenue)" was treated as a literal column name, not a reference to the aggregated value aliased as "A".

Solution:
Modified ddpui/core/charts/charts_service.py in the apply_chart_sorting function. A fallback mechanism has been added: if the sort column name does not match any metric.alias, the code now attempts a case-insensitive match against the aggregation expression pattern f"{metric.aggregation}({metric.column})". Once a matching metric is found through this fallback, the existing logic correctly generates the SQL alias (e.g., A) for the ORDER BY clause, resolving the UndefinedColumn error.

Fixes DALGO-BACKEND-26D

[sentry]

Codecov Report

❌ Patch coverage is 0% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 58.64%. Comparing base (75cb6fd) to head (74977f9).

Files with missing lines	Patch %	Lines
ddpui/core/charts/charts_service.py	0.00%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1395      +/-   ##
==========================================
- Coverage   58.66%   58.64%   -0.03%     
==========================================
  Files         132      132              
  Lines       15690    15697       +7     
==========================================
  Hits         9205     9205              
- Misses       6485     6492       +7     

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