ui: Constants refactor (#26908)

* refactor: Constants

* refactor: Constants/Enums cleanup

* refactor: Constant objects instead of multiple single value constants

* refactor: Cleanup constants

tools/ui/src/lib/constants/cache.constants.ts

@@ -0,0 +1,44 @@
+/**
+ * Cache configuration constants
+ */
+
+/**
+ * Default cache limits when no per-cache overrides are given.
+ */
+export const CACHE = {
+	/** Default maximum number of entries in a cache */
+	DEFAULT_MAX_ENTRIES: 100,
+	/** Default TTL (Time-To-Live) for cache entries in milliseconds (5 minutes) */
+	DEFAULT_TTL_MS: 5 * 60 * 1000
+} as const;
+
+/**
+ * TTL and size for the model props cache.
+ * Props don't change frequently, so we can cache them longer.
+ */
+export const MODEL_PROPS_CACHE = {
+	/** Maximum number of model props to cache */
+	MAX_ENTRIES: 50,
+	/** TTL for model props cache entries in milliseconds (10 minutes) */
+	TTL_MS: 10 * 60 * 1000
+} as const;
+
+/**
+ * TTL and size for the MCP resource cache.
+ */
+export const MCP_RESOURCE_CACHE = {
+	/** Maximum number of MCP resources to cache */
+	MAX_ENTRIES: 50,
+	/** TTL for MCP resource cache entries in milliseconds (5 minutes) */
+	TTL_MS: 5 * 60 * 1000
+} as const;
+
+/**
+ * Limits for pruning inactive conversation states held in memory.
+ */
+export const INACTIVE_CONVERSATION = {
+	/** Maximum age (in ms) for inactive conversation states before cleanup (30 minutes) */
+	MAX_AGE_MS: 30 * 60 * 1000,
+	/** Maximum number of inactive conversation states to keep in memory */
+	MAX_STATES: 10
+} as const;