feat: initialize thoughts-frontend with Next.js, TypeScript, and ESLint

- Add ESLint configuration for Next.js and TypeScript support.
- Create Next.js configuration file with standalone output option.
- Initialize package.json with scripts for development, build, and linting.
- Set up PostCSS configuration for Tailwind CSS.
- Add SVG assets for UI components.
- Create TypeScript configuration for strict type checking and module resolution.

thoughts-backend/app/Cargo.toml

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+[package]
+name = "app"
+version = "0.1.0"
+edition = "2021"
+publish = false
+
+[lib]
+name = "app"
+path = "src/lib.rs"
+
+[dependencies]
+models = { path = "../models" }
+
+sea-orm = { workspace = true }

thoughts-backend/app/README.md

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+# app
+
+No axum or api dependencies should be introduced into this folder.

thoughts-backend/app/src/config.rs

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+pub struct Config {
+    pub db_url: String,
+    pub host: String,
+    pub port: u32,
+    pub prefork: bool,
+}
+
+impl Config {
+    pub fn from_env() -> Config {
+        Config {
+            db_url: std::env::var("DATABASE_URL").expect("DATABASE_URL is not set in .env file"),
+            host: std::env::var("HOST").expect("HOST is not set in .env file"),
+            port: std::env::var("PORT")
+                .expect("PORT is not set in .env file")
+                .parse()
+                .expect("PORT is not a number"),
+            prefork: std::env::var("PREFORK").is_ok_and(|v| v == "1"),
+        }
+    }
+
+    pub fn get_server_url(&self) -> String {
+        format!("{}:{}", self.host, self.port)
+    }
+}

thoughts-backend/app/src/error/mod.rs

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+mod user;
+
+pub use user::UserError;

thoughts-backend/app/src/error/user.rs

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+#[derive(Debug)]
+pub enum UserError {
+    NotFound,
+}
+
+impl std::fmt::Display for UserError {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            UserError::NotFound => write!(f, "User not found"),
+        }
+    }
+}
+
+impl std::error::Error for UserError {}

thoughts-backend/app/src/lib.rs

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+pub mod config;
+pub mod error;
+pub mod persistence;
+pub mod state;

thoughts-backend/app/src/persistence/blog.rs

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+use sea_orm::{ActiveModelTrait, ColumnTrait, DbConn, DbErr, EntityTrait, QueryFilter, Set};
+
+use models::{domains::blog, params::blog::CreateBlogParams, queries::blog::BlogQuery};
+
+pub async fn search_blogs(db: &DbConn, query: BlogQuery) -> Result<Vec<blog::Model>, DbErr> {
+    blog::Entity::find()
+        .filter(blog::Column::Title.contains(query.title.unwrap_or_default()))
+        .all(db)
+        .await
+}
+
+pub async fn create_blog(
+    db: &DbConn,
+    params: CreateBlogParams,
+) -> Result<blog::ActiveModel, DbErr> {
+    blog::ActiveModel {
+        author_id: Set(params.author_id as i32),
+        title: Set(params.title),
+        content: Set(params.content),
+        ..Default::default()
+    }
+    .save(db)
+    .await
+}

thoughts-backend/app/src/persistence/mod.rs

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+pub mod blog;
+pub mod user;

thoughts-backend/app/src/persistence/user.rs

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+use sea_orm::{ActiveModelTrait, ColumnTrait, DbConn, DbErr, EntityTrait, QueryFilter, Set};
+
+use models::domains::user;
+use models::params::user::CreateUserParams;
+use models::queries::user::UserQuery;
+
+pub async fn create_user(
+    db: &DbConn,
+    params: CreateUserParams,
+) -> Result<user::ActiveModel, DbErr> {
+    user::ActiveModel {
+        username: Set(params.username),
+        ..Default::default()
+    }
+    .save(db)
+    .await
+}
+
+pub async fn search_users(db: &DbConn, query: UserQuery) -> Result<Vec<user::Model>, DbErr> {
+    user::Entity::find()
+        .filter(user::Column::Username.contains(query.username.unwrap_or_default()))
+        .all(db)
+        .await
+}
+
+pub async fn get_user(db: &DbConn, id: i32) -> Result<Option<user::Model>, DbErr> {
+    user::Entity::find_by_id(id).one(db).await
+}

thoughts-backend/app/src/state.rs

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+use sea_orm::DatabaseConnection;
+
+#[derive(Clone)]
+pub struct AppState {
+    pub conn: DatabaseConnection,
+}