refactor: fix HIGH+MEDIUM architectural violations from code review

HIGH: fix watch_medium data-loss bug, standardize error handling on
ApiError, fix dep direction (rss/template-askama no longer dep on
application), extract ImageFetcher port (remove reqwest from app layer),
move event construction from save_review to use case, extract
infra-wiring crate (DbPool/EventBusBackend dedup), deduplicate
presentation helpers (encode_error, export streaming, multipart parsing)

MEDIUM: split LocalApContentQuery god-trait 10→3 methods, dedup movie
resolution orchestration, add RemoteActorDto/PersonDto mappers, move
AppConfig to infra-wiring, fix SocialQueryPort Uuid→UserId, replace
stringly-typed api-types with domain enums, move count_reviews_in_year
to StatsRepository, dedup event publisher cfg blocks, extract
should_enrich, move group_by_month to application, dedup
count_local_posts, add FederationFlags Default, TUI input helper +
ShowError rename + typed auth errors, api-types cleanup
(UserSettingsDto/UserProfileBase/PreviewRowData)

102 files changed, -681 lines net

crates/domain/src/models/federation.rs

@@ -19,6 +19,16 @@ pub struct FederationFlags {
     pub watchlist: bool,
 }
 
+impl Default for FederationFlags {
+    fn default() -> Self {
+        Self {
+            goals: true,
+            reviews: true,
+            watchlist: true,
+        }
+    }
+}
+
 #[derive(Debug, Clone)]
 pub struct FederatedProfile {
     pub actor_url: String,

crates/domain/src/models/mod.rs

@@ -57,7 +57,8 @@ pub use search::{
 
 use crate::errors::DomainError;
 
-#[derive(Clone, Debug, PartialEq, Eq)]
+#[derive(Clone, Debug, PartialEq, Eq, serde::Serialize, serde::Deserialize)]
+#[serde(rename_all = "snake_case")]
 pub enum GoalType {
     Movies,
 }

crates/domain/src/models/user.rs

@@ -1,6 +1,7 @@
 use crate::value_objects::{Email, PasswordHash, UserId, Username};
 
-#[derive(Clone, Debug, Default)]
+#[derive(Clone, Debug, Default, serde::Serialize, serde::Deserialize)]
+#[serde(rename_all = "snake_case")]
 pub enum UserRole {
     #[default]
     Standard,