chore: update iOS metadata and streamline release script for whatsnew files

ios/fastlane/metadata/en-US/description.txt

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+Conduit is an open-source, native mobile client for Open‑WebUI. Connect to your own server to chat with AI models, manage conversations, and take your self‑hosted AI with you—securely and on the go.
+
+Features
+- Real-time streaming chat
+- Model selection
+- Conversation search and management
+- Voice input (speech-to-text)
+- File and image uploads for retrieval-augmented generation (RAG)
+- Voice calling with on-device processing
+- Tools support
+- Markdown rendering with syntax highlighting
+- Light, dark, and system themes
+- Secure credential storage (Keychain/Keystore)
+
+Requirements
+- Requires an existing Open‑WebUI server. Conduit does not host or provide AI models.
+- No data is sent to third-party services by default; everything stays with your configured server.
+
+Permissions
+- Microphone: Voice input
+- Camera and Photos/Storage: Image/file attachments
+- Network: Connect to your Open‑WebUI server
+
+Open Source:
+Conduit is an open-source project. For support, to report issues, or to view the source code, please visit our GitHub repository:
+
+https://github.com/cogwheel0/conduit
+
+-----
+
+Disclaimer: This is an independent, third-party application licensed under the GNU General Public License v3.0 (GPLv3) and is not officially affiliated with the Open WebUI project.

ios/fastlane/metadata/en-US/keywords.txt

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+conduit, openwebui, ai chat, llm chat, self hosted ai, ollama

ios/fastlane/metadata/en-US/marketing_url.txt

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+https://github.com/cogwheel0/conduit

ios/fastlane/metadata/en-US/name.txt

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+Conduit: OpenWebUI Client

ios/fastlane/metadata/en-US/privacy_url.txt

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+https://github.com/cogwheel0/conduit/blob/main/PRIVACY_POLICY.md

ios/fastlane/metadata/en-US/promotional_text.txt

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+Patch Release: Fix server side tts

ios/fastlane/metadata/en-US/subtitle.txt

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+Chat with self‑hosted AI

ios/fastlane/metadata/en-US/support_url.txt

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+https://github.com/cogwheel0/conduit/issues

ios/fastlane/metadata/en-US/whatsnew.txt

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+https://github.com/cogwheel0/conduit/releases/tag/v2.1.14
+