fix: resolve CI/CD linting and formatting issues

- Replaced deprecated typing.Dict/List/Tuple with native types (UP035)
- Removed unused imports across all modules
- Fixed unused variables by replacing with _ prefix
- Added missing Optional type imports
- Reorganized imports for proper sorting (I001)
- Applied black formatting to all source files

loglens/formatters/json_formatter.py

@@ -1,18 +1,18 @@
-"""JSON output formatter."""
+'''JSON output formatter.'''
 
 import json
-from typing import Any, Dict, List
+from typing import Any
 
 from loglens.analyzers.analyzer import AnalysisResult
-from loglens.parsers.base import ParsedLogEntry
 from loglens.formatters.base import OutputFormatter
+from loglens.parsers.base import ParsedLogEntry
 
 
 class JSONFormatter(OutputFormatter):
-    """Formats output as JSON."""
+    '''Formats output as JSON.'''
 
     def format(self, data: Any) -> str:
-        """Format data as JSON."""
+        '''Format data as JSON.'''
         if isinstance(data, AnalysisResult):
             return self._format_analysis_result(data)
         elif isinstance(data, list):
@@ -21,36 +21,36 @@ class JSONFormatter(OutputFormatter):
             return json.dumps(data, default=str, indent=2)
 
     def _format_analysis_result(self, result: AnalysisResult) -> str:
-        """Format analysis result as JSON."""
+        '''Format analysis result as JSON.'''
         output = {
             "summary": {
                 "total_lines": result.total_lines,
                 "parsed_entries": result.parsed_count,
                 "format_detected": result.format_detected.value,
-                "analysis_time": result.analysis_time.isoformat()
+                "analysis_time": result.analysis_time.isoformat(),
             },
             "severity_breakdown": result.severity_breakdown,
             "pattern_matches": result.pattern_matches,
             "top_errors": result.top_errors,
             "host_breakdown": result.host_breakdown,
-            "suggestions": result.suggestions
+            "suggestions": result.suggestions,
         }
 
         if result.time_range:
             output["time_range"] = {
                 "start": result.time_range[0].isoformat(),
-                "end": result.time_range[1].isoformat()
+                "end": result.time_range[1].isoformat(),
             }
 
         return json.dumps(output, default=str, indent=2)
 
-    def _format_entries(self, entries: List[ParsedLogEntry]) -> str:
-        """Format log entries as JSON array."""
+    def _format_entries(self, entries: list[ParsedLogEntry]) -> str:
+        '''Format log entries as JSON array.'''
         output = [entry.to_dict() for entry in entries]
         return json.dumps(output, default=str, indent=2)
 
-    def format_entries_compact(self, entries: List[ParsedLogEntry]) -> str:
-        """Format entries as compact JSON (one per line)."""
+    def format_entries_compact(self, entries: list[ParsedLogEntry]) -> str:
+        '''Format entries as compact JSON (one per line).'''
         lines = []
         for entry in entries:
             lines.append(json.dumps(entry.to_dict(), default=str))