systems rework: buffs, prestige graph, research, modular architecture

Decouples core systems from centralized globals in favor of catalogue-based architecture and data-driven content.

   Key changes:
   - Prestige: node-based buff tech tree, graph panel, progress bar
   - Research: multi-worker system, per-generator research, xp generation
   - Ascension: meta-currency layer via multi-currency prestige resets
   - Buffs: refactored as generator-independent via catalogues
   - UI: currency panel, edge-scrolling camera + zoom, current-goal panel
   - Alchemy Tower: crafting building with recipe/cost system
   - Testing: 7 test suites (ascension, prestige, research, goals)
   - Content: migrated from hardcoded idles/ to gym format (tiny_sword)

docs/gyms/tiny_sword/prestige/primary_prestige.tres

@@ -0,0 +1,9 @@
+[gd_resource type="Resource" script_class="PrestigeConfig" format=3 uid="uid://dwmfvmusfskk6"]
+
+[ext_resource type="Script" uid="uid://w34t58rpkoui" path="res://core/prestige/prestige_config.gd" id="1_3tg3a"]
+
+[resource]
+script = ExtResource("1_3tg3a")
+id = &"ascension"
+prestige_currency_id = &"ascension"
+basis = 3