feat: add optional mood to thoughts with custom moods support

Mood is an optional label+emoji string (e.g. "relaxed 😌") on thoughts.
Users can define up to 8 custom moods in profile settings.
Mood federates via AP Note JSON and displays on thought cards.

crates/api-types/src/requests.rs

@@ -31,6 +31,7 @@ pub struct CreateThoughtRequest {
     pub visibility: Option<String>,
     pub content_warning: Option<String>,
     pub sensitive: Option<bool>,
+    pub mood: Option<String>,
 }
 
 #[derive(Deserialize, utoipa::ToSchema)]
@@ -48,6 +49,7 @@ pub struct UpdateProfileRequest {
     pub header_url: Option<String>,
     pub custom_css: Option<String>,
     pub profile_fields: Option<Vec<crate::responses::ProfileField>>,
+    pub custom_moods: Option<Vec<crate::responses::ProfileField>>,
 }
 
 #[derive(Deserialize, utoipa::ToSchema)]

crates/api-types/src/responses.rs

@@ -20,6 +20,7 @@ pub struct UserResponse {
     pub header_url: Option<String>,
     pub custom_css: Option<String>,
     pub profile_fields: Vec<ProfileField>,
+    pub custom_moods: Vec<ProfileField>,
     pub local: bool,
     pub is_followed_by_viewer: bool,
     #[serde(rename = "joinedAt")]
@@ -48,6 +49,8 @@ pub struct ThoughtResponse {
     pub updated_at: Option<DateTime<Utc>>,
     #[serde(skip_serializing_if = "Option::is_none")]
     pub note_extensions: Option<serde_json::Value>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub mood: Option<String>,
 }
 
 #[derive(Serialize, utoipa::ToSchema)]