Add SQLite persistence, per-player NPC attitude system, character creation, and combat

- Add trait-based DB layer (db.rs) with SQLite backend for easy future swapping
- Player state persisted to SQLite: stats, inventory, equipment, room position
- Returning players skip chargen and resume where they left off
- Replace boolean hostile flag with 5-tier attitude system (friendly/neutral/wary/aggressive/hostile)
- Per-player NPC attitudes stored in DB, shift on kills with faction propagation
- Add character creation flow (chargen.rs) with data-driven races and classes from TOML
- Add turn-based combat system (combat.rs) with XP, leveling, and NPC respawn
- Add commands: take, drop, inventory, equip, use, examine, talk, attack, flee, stats
- Add world data: 5 races, 4 classes, hostile NPCs (rat, thief), new items

Made-with: Cursor

world/races/dwarf.toml

@@ -0,0 +1,9 @@
+name = "Dwarf"
+description = "Stout and unyielding, dwarves are born of stone and stubbornness."
+
+[stats]
+strength = 1
+dexterity = -1
+constitution = 2
+intelligence = 0
+wisdom = 0

world/races/elf.toml

@@ -0,0 +1,9 @@
+name = "Elf"
+description = "Graceful and keen-eyed, elves possess an innate affinity for magic."
+
+[stats]
+strength = -1
+dexterity = 2
+constitution = -1
+intelligence = 2
+wisdom = 0

world/races/halfling.toml

@@ -0,0 +1,9 @@
+name = "Halfling"
+description = "Small and nimble, halflings slip through danger with uncanny luck."
+
+[stats]
+strength = -2
+dexterity = 3
+constitution = 0
+intelligence = 0
+wisdom = 1

world/races/human.toml

@@ -0,0 +1,9 @@
+name = "Human"
+description = "Versatile and adaptable, humans excel through sheer determination."
+
+[stats]
+strength = 0
+dexterity = 0
+constitution = 0
+intelligence = 0
+wisdom = 0

world/races/orc.toml

@@ -0,0 +1,9 @@
+name = "Orc"
+description = "Powerful and fierce, orcs channel raw fury into everything they do."
+
+[stats]
+strength = 3
+dexterity = 0
+constitution = 1
+intelligence = -2
+wisdom = -1