Enhanced Episode Handling, Duration Calculation, and Exception Handling in Video Models and Services

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These changes provide more robust and flexible handling of episodic video content, refined duration estimates for better user feedback, and improved error handling across file-based services.

1. Episode Range Handling:

• Added episode_numbers method to DiskTitle and VideoBlob to support handling of episodes spanning multiple numbers.

• Updated ScanPlexWorker to handle both the starting and ending episode numbers, enhancing episode lookup in cases where multiple episodes are represented in a single video blob.

2. Duration Calculation Enhancements:

• Refactored duration_range method in the Tv model to compute episode and disk title durations more effectively, integrating interquartile range and weighted averages for more accurate time estimates.

• Added DEFAULT_RANGE in Video to provide a baseline for duration calculations.

• Enhanced StatsService to include z-score calculation and additional statistical data (differences), allowing outlier filtering in duration calculations.

3. Error Handling for File Access:

• Added exception handling in UploadMkvService to destroy video_blob entries when the associated file is not found, preventing orphaned entries and ensuring system consistency.

4. Regex Updates for Key Parsing:

• Extended KeyParserService to detect episode ranges within filenames, adding support for patterns like S01E01-E02.

5. UI Enhancements:

• Updated duration information display in seasons/show.html.erb, showing calculated duration ranges and debug information for enhanced insight into the duration statistics when debug mode is active.