Add `sm tail` log viewer (Pail-equivalent)

[antosubash]

Background

There is no built-in way to tail logs from the CLI in a developer-friendly format. Devs either use tail -f on the Serilog file (verbose, hard to filter) or rely on the IDE console. Laravel Pail provides a pretty, filterable, real-time log viewer.

Motivation

• One command to see what the running app is doing
• Filter by level, message, user, request-id without grep gymnastics
• Works against local file sink and a running process

Design sketch

New CLI command sm tail:

• Reads the configured Serilog file sink (or stdin if piped)
• Pretty-prints with color: timestamp, level, source, message, scoped properties
• Flags:
  • --level Error (filter by min level)
  • --filter "user:42" (substring on properties)
  • --source MyModule.SomeClass (logger name match)
  • --user 42 (UserId property filter)
  • --request <id> (RequestId property filter)
  • --json (raw JSON pass-through, for piping)
• Follow mode by default; --no-follow for one-shot
• Multi-file: if running against the AppHost orchestrator, merges streams by timestamp and labels each line with its source

Implementation: parse Serilog Compact JSON formatter output (renderedCompactJson); fall back to plain-text log files with regex.

Acceptance criteria

• sm tail command in cli/SimpleModule.Cli
• Color output respecting NO_COLOR
• All listed filter flags
• Multi-file merged tail mode
• xUnit tests for parser + filter logic
• Docs page with screenshot

References

• Laravel Pail: https://laravel.com/docs/logging#tailing-log-messages-using-pail
• Serilog Compact JSON: https://github.com/serilog/serilog-formatting-compact