Initial scaffold: Nakama backend, Godot client, content schema

Sets up the Step 1 (Project Foundation) and Step 2 (Content Schemas) scaffold
from the implementation sequence. Includes Docker Compose stack, Nakama
TypeScript module stubs, PostgreSQL migration, Godot 4 project shell with
scene stubs and NakamaClient singleton, YAML content schemas for all entity
types, and example data for 3 characters, 2 jobs, and all 7 core resources.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

content/data/characters/lyra_stoneheart.yaml

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+# Lyra Stoneheart / Leon Stoneheart
+# SSR | Tank | Miner
+# Starter-region character. Designed to anchor the early assignment economy:
+# she is the primary miner for the PoC and functions as the front-row tank
+# in combat. Her kit is intentionally simple — the first character the player
+# will level up and use to validate both the assignment and combat systems.
+
+$schema: "xyvera/content-schema/character/v1"
+
+id: lyra_stoneheart
+
+name:
+  female: "Lyra Stoneheart"
+  male: "Leon Stoneheart"
+
+rarity: SSR
+combat_role: tank
+profession: miner
+region_origin: heartwood_vale
+element: earth
+personality: stoic_protector
+
+base_stats:
+  hp: 1200
+  attack: 80
+  defense: 160
+  speed: 70
+  crit_rate: 0.04
+  crit_damage: 1.4
+
+skills:
+  - id: stone_resolve
+    name: "Stone Resolve"
+    type: passive
+    description: >
+      Passive: when HP drops below 40%, gain a shield equal to 15% of max HP.
+      Triggers once per combat.
+    max_level: 5
+    upgrade_cost_per_level:
+      knowledge: 20
+      gold: 150
+
+  - id: seismic_slam
+    name: "Seismic Slam"
+    type: ultimate
+    description: >
+      Deals 180% ATK as earth damage to all front-row enemies and reduces their
+      defense by 20% for 2 turns.
+    max_level: 5
+    upgrade_cost_per_level:
+      knowledge: 40
+      gold: 300
+
+  - id: miners_grit
+    name: "Miner's Grit"
+    type: passive
+    description: >
+      Village passive: when assigned to a Mining slot, stone output gains an
+      additional +10% per skill level on top of the suitability multiplier.
+    max_level: 5
+    upgrade_cost_per_level:
+      knowledge: 15
+      gold: 100
+
+suitability_bonuses:
+  primary_profession_multiplier: 1.6   # slightly above default 1.5 due to Miner's Grit
+  secondary_professions:
+    - construction                      # knows how to work with stone
+
+bond_hooks:
+  - loyalty
+  - protector
+  - stoic
+
+lore_summary: >
+  A former quarry foreman who arrived in this world mid-shift, still gripping her pickaxe.
+  She doesn't talk much about home, but she builds like she's trying to recreate it.