Fix "pushi_it" to "push_it" naming inconsistencies throughout codebase

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This PR corrects naming inconsistencies where "pushi_it" was used instead of the correct addon name "push_it" throughout the codebase. The issue affected user-facing elements, internal code references, and configuration files.

Changes Made

Package Configuration:

• Updated package.yml and composer.json to use correct package name "push_it"
• Fixed all permission names from "pushi_it[]" to "push_it[]"

PHP Code:

• Updated all addon references from rex_addon::get('pushi_it') to rex_addon::get('push_it')
• Fixed backend page URLs from "pushi_it" to "push_it"
• Updated error/log messages from "PushiIt:" to "PushIt:"

JavaScript:

• Renamed global variables: PushiIt → PushIt, PushiItPublicKey → PushItPublicKey
• Fixed function names and localStorage keys
• Updated all onclick handlers and JavaScript references

Backward Compatibility

To ensure existing installations continue working, the following were intentionally preserved:

• Database table names (rex_pushi_it_subscriptions, rex_pushi_it_notifications)
• API endpoint names (pushi_it_subscribe, pushi_it_unsubscribe)
• Asset file paths (/assets/addons/pushi_it/)

Impact

• 14 files changed with 93 insertions and 93 deletions
• Zero breaking changes - all critical compatibility preserved
• User-facing consistency - addon now correctly displays as "push_it" throughout the interface

The addon now uses consistent naming while maintaining full backward compatibility for existing users and integrations.

Fixes #1.

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