Remove Twilio Push Credential references and add real Firebase config

All FCM push notifications are handled by WordPress backend (TWP_FCM),
so Twilio Push Credentials are unnecessary. Also replaces placeholder
google-services.json with real Firebase project config (twp-softphone).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

CLAUDE.md

@@ -6,8 +6,26 @@
 - **URL**: `https://phone.cloud-hosting.io/`
 - **Deployment**: rsync to Docker (remote server only, not local)
 - **SDK**: Twilio PHP SDK v8.7.0
+- **PHP**: 8.0+ required
+- **Optional**: AWS SDK (`aws/aws-sdk-php`) for SNS SMS provider
 - **External SDK**: `wp-content/twilio-sdk/` (survives plugin updates)
 
+## Commands
+- **Install SDK (recommended)**: `./install-twilio-sdk-external.sh` (installs to `wp-content/twilio-sdk/`)
+- **Install SDK (internal)**: `./install-twilio-sdk.sh` (installs to `vendor/`, lost on plugin update)
+- **Test SDK**: `php test-sdk.php`
+- **Composer install SDK**: `composer install-sdk`
+- **Deploy**: rsync to Docker (remote server, see production path above)
+- **CI/CD**: Gitea workflows in `.gitea/workflows/` — `release.yml`, `update-version.yml`
+
+## Directory Structure
+- `twilio-wp-plugin.php` — Main plugin file, constants, SDK loading
+- `includes/` — All backend classes (28 class files)
+- `admin/` — Admin UI class (`TWP_Admin`), mobile app settings page
+- `assets/js/` — Browser phone JS, service worker
+- `assets/images/`, `assets/sounds/` — Static assets
+- `.gitea/workflows/` — CI/CD (release, version update)
+
 ## Phone Variable Names
 **Use**: `incoming_number`, `agent_number`, `customer_number`, `workflow_number`, `queue_number`, `default_number`  
 **Don't use**: `from_number`, `to_number`, `phone_number`, `$agent_phone`  
@@ -18,11 +36,20 @@
 - **TWP_Admin**: Has `find_customer_call_leg()` - CRITICAL for call control
 - **TWP_TTS_Helper**: ElevenLabs/Alice fallback, 30-day cache
 - **TWP_User_Queue_Manager**: Auto-creates queues/extensions (100-9999)
-- **TWP_Webhooks**: 26 endpoints at `twilio-webhook/v1`
-- **TWP_Activator**: Creates 15 DB tables, run `ensure_tables_exist()` if missing
+- **TWP_Webhooks**: 35 endpoints at `twilio-webhook/v1`
+- **TWP_Activator**: Creates 16 DB tables, run `ensure_tables_exist()` if missing
+- **TWP_Core**: Main plugin orchestrator, hooks all classes together
+- **TWP_SMS_Manager**: SMS abstraction with provider interface
+- **TWP_SMS_Provider_Twilio** / **TWP_SMS_Provider_SNS**: SMS providers (Twilio default, AWS SNS optional)
+- **TWP_Mobile_API**: REST API for mobile app
+- **TWP_Mobile_Auth** / **TWP_Mobile_SSE** / **TWP_FCM**: Mobile auth, server-sent events, push notifications
+- **TWP_Call_Queue**: Queue operations and management
+- **TWP_Callback_Manager**: Callback request handling
+- **TWP_Workflow**: Workflow step execution engine
+- **TWP_Auto_Updater**: Plugin auto-update from Gitea releases
 
 ## Database
-15 tables with `twp_` prefix. Key notes:
+16 tables with `twp_` prefix. Key notes:
 - `twp_call_queues`: User queues (general/personal/hold)
 - `twp_agent_status`: Has `auto_busy_at` for 1-min auto-revert
 - `twp_queued_calls`: Uses `enqueued_at` not `joined_at`
@@ -41,32 +68,6 @@ $api->update_call($customer_call_sid, ['twiml' => $twiml_xml]);
 - Queue: Pass `waitUrl` as option in `enqueue()`
 - TwiML: Use SDK classes, not raw XML
 
-## Recent Changes (v2.3.0)
-- Browser phone moved to admin-only
-- Call control uses `find_customer_call_leg()` to prevent disconnections
-- Auto-creates user queues/extensions when needed
-- Firefox support added
-- 1-min agent status auto-revert
-
-## SDK Installation
-- **External SDK (Recommended)**: Use `install-twilio-sdk-external.sh` to install SDK to `wp-content/twilio-sdk/`
-  - Survives WordPress plugin updates
-  - SDK location defined by `TWP_EXTERNAL_SDK_DIR` constant
-  - Loading priority: External first, then internal `vendor/` fallback
-- **Internal SDK (Alternative)**: Use `install-twilio-sdk.sh` to install to `vendor/`
-  - Will be deleted when WordPress updates the plugin
-  - Requires reinstallation after each plugin update
-- **SDK Loading**: Plugin checks external location first via autoloader, falls back to internal
-- **Post-Update Detection**: Hook on `upgrader_process_complete` checks SDK status and shows warning
-
-## Browser Phone Configuration
-- **Edge Location Setting**: Configurable via Settings → Twilio Edge Location
-  - Default: `roaming` (auto-select closest edge)
-  - Options: ashburn, umatilla, dublin, frankfurt, singapore, sydney, tokyo, sao-paulo
-  - Stored in: `twp_twilio_edge` option
-  - Used by: Browser phone JavaScript for WebRTC connection
-  - Critical: Wrong edge causes immediate call failures (e.g., US calls with Sydney edge)
-
 ## Development Notes
 - **API**: E.164 format (+1XXXXXXXXXX)
 - **Database**: Use `$wpdb`, prepared statements
@@ -79,30 +80,24 @@ $api->update_call($customer_call_sid, ['twiml' => $twiml_xml]);
 - User-specific queues with extensions
 - Browser phone at `admin.php?page=twilio-wp-browser-phone`
 - ElevenLabs TTS with Alice fallback
-- 68 AJAX actions, 26 REST endpoints
+- 77 AJAX actions, 35 REST endpoints
+- Browser phone moved to admin-only (v2.3.0)
+- Firefox, Chrome, Safari, Edge support
+- 1-min agent status auto-revert
 
-## Recent Technical Changes (v2.8.9)
+## SDK Loading
+- **External SDK (Recommended)**: `wp-content/twilio-sdk/` — survives plugin updates
+- **Internal SDK**: `vendor/` — deleted on plugin update, needs reinstall
+- Loading priority: External first (`TWP_EXTERNAL_SDK_DIR`), then internal fallback
+- Post-update hook (`upgrader_process_complete`) warns if SDK missing
 
-### SDK Persistence Between Plugin Updates
-- **Problem**: WordPress plugin updates delete entire plugin folder including `vendor/` SDK
-- **Solution**: External SDK installation at `wp-content/twilio-sdk/` survives updates
-- **Implementation**:
-  - New constant: `TWP_EXTERNAL_SDK_DIR` points to `wp-content/twilio-sdk/`
-  - Loading priority in `twp_check_sdk_installation()`: External first, internal fallback
-  - Classes updated: `TWP_Twilio_API`, `TWP_Webhooks` constructors check external location first
-  - New script: `install-twilio-sdk-external.sh` automates external installation
-  - Post-update hook: `twp_check_sdk_after_update()` detects missing SDK after updates
-  - Admin notices: `twp_sdk_missing_notice()` shows both installation options
-  - Warning system: `twp_show_sdk_update_warning()` via transient after plugin updates
+## Browser Phone Configuration
+- **Edge Location**: `twp_twilio_edge` option, default `roaming`
+- Options: roaming, ashburn, umatilla, dublin, frankfurt, singapore, sydney, tokyo, sao-paulo
+- Wrong edge causes immediate call failures (e.g., US calls with Sydney edge)
 
-### US Calls Failing Fix (Browser Phone)
-- **Problem**: Browser phone had hardcoded `edge: 'sydney'`, causing US calls to fail with immediate HANGUP
-- **Solution**: Configurable edge location via WordPress settings
-- **Implementation**:
-  - New setting: `twp_twilio_edge` with default value `roaming`
-  - Settings UI: Dropdown in admin settings with 8 edge options
-  - Browser phone JS: Uses `get_option('twp_twilio_edge', 'roaming')` instead of hardcoded value
-  - Edge options: roaming, ashburn, umatilla, dublin, frankfurt, singapore, sydney, tokyo, sao-paulo
+## Changelog
+See `README.md` for detailed version history. Current version: v2.8.9.
 
 ---
-*Updated: Jan 2026*
+*Updated: Mar 2026*