Add last login tracking to admin user management

[Copilot]

Implements user activity tracking by recording and displaying last login timestamps in the admin panel.

Changes

• Database: Added last_login TEXT column to users table with ALTER TABLE migration for existing databases
• Authentication: Login route now records UTC timestamp (ISO 8601) on successful authentication
• User Model: Extended to include last_login field; updated all user queries accordingly
• Admin UI: Added "Last Login" column to manage_users table with human-readable formatting (YYYY-MM-DD HH:MM:SS UTC)
• Template Filter: Added format_datetime filter to convert ISO timestamps; displays "Never" for null values

Implementation

# On successful login
with sqlite3.connect(DATABASE, timeout=10) as conn:
    c = conn.cursor()
    c.execute('UPDATE users SET last_login=? WHERE username=?',
              (datetime.now(timezone.utc).isoformat(), username))
    conn.commit()

Screenshot

Shows three users with different login states: recent login, older login, and never logged in.

Warning

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• iptv.lan
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If you need me to access, download, or install something from one of these locations, you can either:

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Original prompt

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This section details on the original issue you should resolve

<issue_title>Display last login time on admin panel</issue_title>
<issue_description>Add a feature to the admin panel that shows the last login time for each user. This involves:

• Adding a 'last_login' timestamp field to the user database
• Updating authentication logic to update last_login on sign-in
• Display the timestamp in the admin user management interface
  This improves visibility for admins and supports user activity tracking.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Display last login time on admin panel #76

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[thehack904]

Files have been reviewed and tested. Code works and is good to go.