Add core flow docs

project-specs/CHANGE_PASSWORD_FLOW.md

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+# Change Password Flow
+
+Flow untuk mengganti password akun dokter.
+
+```mermaid
+flowchart LR
+  A["Settings"] --> B["Change Password"]
+  B --> C["Isi current password"]
+  C --> D["Isi new password"]
+  D --> E["Confirm password"]
+  E --> F["Submit form"]
+  F --> G["POST /auth/change_password"]
+  G --> H["Redirect ke Settings"]
+```
+
+## Ringkas
+
+- Buka menu settings.
+- Masuk ke form change password.
+- Isi password lama, password baru, dan konfirmasi.
+- Submit ke endpoint auth change password.
+- Jika sukses, kembali ke settings.
+