feat: refactor parsing and scanning logic for test files

- Updated `parseFilename` to `parseTargetFilename` and modified its return structure to include `test_id` instead of `file_id`.
- Introduced `parseResultFilename` to extract `test_id` and `device` from result file names.
- Enhanced `fullScan` to separately handle target and results directories, improving clarity and functionality.
- Updated database interactions to use `test_id` instead of `file_id` across various modules.
- Added a new `/rescan` endpoint to trigger a full scan of target and results directories.
- Improved logging and error handling throughout the scanning process.
- Introduced `parseTputRssi` to extract throughput and RSSI data from log files.

DESIGNPLAN.md

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+## Design Plan
+
+**Inputs**: target tests directory, result tests directory 
+
+**Output**: a dashboard that displays completion rate, elapsed time, estimated time remaining, and a list of all tests that can be filtered by tags   
+
+**Requirements**:   
+- A test is marked completed when there is a filename match in result tests directory
+- When there is a change in the input directories, data should update automatically or when refreshed   
+- Dashboard can be accessed by different devices, but input directories are stored locally on one machine  
+    - Add SSO later 
+
+Front end UI requirements: 
+- Completion rate 
+    - Overall completion rate 
+    - CGW 452 completion rate 
+    - CGW453 completion rate 
+
+- Time elapsed 
+- Estimated Time remaining 
+- List of all tests 
+    - Can filter by Tags:  
+        - Completed: Boolean  
+        - Device: String  
+        -  Rotation: String  
+        - Test Point: String 
+        - Station: String 
+        - Band: String 
+        - Channel: String 
+        - Bandwidth: String 
+        - RSSI: String 
+        - Direction: String