feat: Improve CSAT responses (#11485)

# Pull Request Template

## Description

This PR introduces basic customization options for the CSAT survey:

* **Display Type**: Option to use star ratings instead of emojis.
* **Message Text**: Customize the survey message (up to 200 characters).
* **Survey Rules**: Send surveys based on labels — trigger when a
conversation has or doesn't have a specific label.

Fixes
https://linear.app/chatwoot/document/improve-csat-responses-a61cf30e054e

## Type of change

- [x] New feature (non-breaking change which adds functionality)

## How Has This Been Tested?

### Loom videos

**Website Channel (Widget)**

https://www.loom.com/share/7f47836cde7940ae9d17b7997d060a18?sid=aad2ad0a-140a-4a09-8829-e01fa2e102c5

**Email Channel (Survey link)**

https://www.loom.com/share/e92f4c4c0f73417ba300a25885e093ce?sid=4bb006f0-1c2a-4352-a232-8bf684e3d757

## Checklist:

- [x] My code follows the style guidelines of this project
- [x] I have performed a self-review of my code
- [x] I have commented on my code, particularly in hard-to-understand
areas
- [ ] I have made corresponding changes to the documentation
- [x] My changes generate no new warnings
- [x] I have added tests that prove my fix is effective or that my
feature works
- [x] New and existing unit tests pass locally with my changes
- [ ] Any dependent changes have been merged and published in downstream
modules

---------

Co-authored-by: Pranav <pranavrajs@gmail.com>

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[7.0].define(version: 2025_05_12_231037) do
+ActiveRecord::Schema[7.0].define(version: 2025_05_14_045638) do
   # These extensions should be enabled to support this database
   enable_extension "pg_stat_statements"
   enable_extension "pg_trgm"
@@ -729,6 +729,7 @@ ActiveRecord::Schema[7.0].define(version: 2025_05_12_231037) do
     t.bigint "portal_id"
     t.integer "sender_name_type", default: 0, null: false
     t.string "business_name"
+    t.jsonb "csat_config", default: {}, null: false
     t.index ["account_id"], name: "index_inboxes_on_account_id"
     t.index ["channel_id", "channel_type"], name: "index_inboxes_on_channel_id_and_channel_type"
     t.index ["portal_id"], name: "index_inboxes_on_portal_id"