Some small Labrinth refactors and fixes (#3698)

* chore(labrinth): fix typos, simplify out `remove_duplicates` func

* fix(labrinth): implement `capitalize_first` so that it can't panic on wide chars

* chore(labrinth): refactor out unneeded clone highlighted by nightly Clippy lints

* chore(labrinth): simplify `capitalize_first` implementation

* fix(labrinth): preserve ordering when deduplicating project field values

This addresses an unintended behavior change on
157647faf2778c74096e624aeef9cdb79539489c.

* fix(labrinth/tests): make `index_swaps` test run successfully

I wonder why we don't run these more often...

* refactor: rename `.env.example` files to `.env.local`, make local envs more consistent between frontend and backend

* chore(labrinth/.env.local): proper email verif. and password reset paths

apps/labrinth/src/models/v3/projects.rs

@@ -1,4 +1,5 @@
-use std::collections::{HashMap, HashSet};
+use std::collections::HashMap;
+use std::mem;
 
 use crate::database::models::loader_fields::VersionField;
 use crate::database::models::project_item::{LinkUrl, ProjectQueryResult};
@@ -8,6 +9,7 @@ use crate::models::ids::{
 };
 use ariadne::ids::UserId;
 use chrono::{DateTime, Utc};
+use itertools::Itertools;
 use serde::{Deserialize, Serialize};
 use validator::Validate;
 
@@ -95,19 +97,6 @@ pub struct Project {
     pub fields: HashMap<String, Vec<serde_json::Value>>,
 }
 
-fn remove_duplicates(values: Vec<serde_json::Value>) -> Vec<serde_json::Value> {
-    let mut seen = HashSet::new();
-    values
-        .into_iter()
-        .filter(|value| {
-            // Convert the JSON value to a string for comparison
-            let as_string = value.to_string();
-            // Check if the string is already in the set
-            seen.insert(as_string)
-        })
-        .collect()
-}
-
 // This is a helper function to convert a list of VersionFields into a HashMap of field name to vecs of values
 // This allows for removal of duplicates
 pub fn from_duplicate_version_fields(
@@ -132,9 +121,9 @@ pub fn from_duplicate_version_fields(
         }
     }
 
-    // Remove duplicates by converting to string and back
+    // Remove duplicates
     for (_, v) in fields.iter_mut() {
-        *v = remove_duplicates(v.clone());
+        *v = mem::take(v).into_iter().unique().collect_vec();
     }
     fields
 }
@@ -624,7 +613,7 @@ pub struct Version {
     pub downloads: u32,
     /// The type of the release - `Alpha`, `Beta`, or `Release`.
     pub version_type: VersionType,
-    /// The status of tne version
+    /// The status of the version
     pub status: VersionStatus,
     /// The requested status of the version (used for scheduling)
     pub requested_status: Option<VersionStatus>,
@@ -880,7 +869,7 @@ impl std::fmt::Display for DependencyType {
 }
 
 impl DependencyType {
-    // These are constant, so this can remove unneccessary allocations (`to_string`)
+    // These are constant, so this can remove unnecessary allocations (`to_string`)
     pub fn as_str(&self) -> &'static str {
         match self {
             DependencyType::Required => "required",

apps/labrinth/src/routes/v2_reroute.rs

@@ -264,11 +264,11 @@ pub fn convert_side_types_v2_bools(
 }
 
 pub fn capitalize_first(input: &str) -> String {
-    let mut result = input.to_owned();
-    if let Some(first_char) = result.get_mut(0..1) {
-        first_char.make_ascii_uppercase();
-    }
-    result
+    input
+        .chars()
+        .enumerate()
+        .map(|(i, c)| if i == 0 { c.to_ascii_uppercase() } else { c })
+        .collect()
 }
 
 #[cfg(test)]

apps/labrinth/src/routes/v3/version_file.rs

@@ -52,10 +52,9 @@ pub async fn get_version_from_hash(
     .map(|x| x.1)
     .ok();
     let hash = info.into_inner().0.to_lowercase();
-    let algorithm = hash_query
-        .algorithm
-        .clone()
-        .unwrap_or_else(|| default_algorithm_from_hashes(&[hash.clone()]));
+    let algorithm = hash_query.algorithm.clone().unwrap_or_else(|| {
+        default_algorithm_from_hashes(std::slice::from_ref(&hash))
+    });
     let file = database::models::DBVersion::get_file_from_hash(
         algorithm,
         hash,
@@ -140,10 +139,9 @@ pub async fn get_update_from_hash(
     .ok();
     let hash = info.into_inner().0.to_lowercase();
     if let Some(file) = database::models::DBVersion::get_file_from_hash(
-        hash_query
-            .algorithm
-            .clone()
-            .unwrap_or_else(|| default_algorithm_from_hashes(&[hash.clone()])),
+        hash_query.algorithm.clone().unwrap_or_else(|| {
+            default_algorithm_from_hashes(std::slice::from_ref(&hash))
+        }),
         hash,
         hash_query.version_id.map(|x| x.into()),
         &**pool,
@@ -577,10 +575,9 @@ pub async fn delete_file(
     .1;
 
     let hash = info.into_inner().0.to_lowercase();
-    let algorithm = hash_query
-        .algorithm
-        .clone()
-        .unwrap_or_else(|| default_algorithm_from_hashes(&[hash.clone()]));
+    let algorithm = hash_query.algorithm.clone().unwrap_or_else(|| {
+        default_algorithm_from_hashes(std::slice::from_ref(&hash))
+    });
     let file = database::models::DBVersion::get_file_from_hash(
         algorithm.clone(),
         hash,
@@ -709,10 +706,9 @@ pub async fn download_version(
     .ok();
 
     let hash = info.into_inner().0.to_lowercase();
-    let algorithm = hash_query
-        .algorithm
-        .clone()
-        .unwrap_or_else(|| default_algorithm_from_hashes(&[hash.clone()]));
+    let algorithm = hash_query.algorithm.clone().unwrap_or_else(|| {
+        default_algorithm_from_hashes(std::slice::from_ref(&hash))
+    });
     let file = database::models::DBVersion::get_file_from_hash(
         algorithm.clone(),
         hash,