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/schema/job.yaml

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+# job.yaml — schema definition for village job/assignment slot definitions
+#
+# Jobs define what characters can be assigned to and what passive resources
+# they generate. All tuning values should be content-driven so the economy
+# can be rebalanced without code changes.
+#
+# PoC jobs (from spec): mining, woodcutting, research, construction, farming
+
+$schema: "xyvera/content-schema/job/v1"
+
+type: object
+required:
+  - id
+  - name
+  - profession
+  - output_resource
+  - base_output_per_hour
+  - max_slots
+
+properties:
+
+  id:
+    type: string
+    pattern: "^[a-z][a-z0-9_]*$"
+    example: "lumber_camp"
+
+  name:
+    type: string
+    example: "Lumber Camp"
+
+  description:
+    type: string
+    example: "Workers harvest wood from the forest edge. Essential for construction and upgrades."
+
+  profession:
+    type: string
+    enum: [miner, lumberjack, researcher, construction, farmer, trainer]
+    description: "Determines which characters receive the suitability bonus when assigned here."
+
+  output_resource:
+    type: string
+    description: "Resource ID produced passively by characters in this job slot."
+    example: "wood"
+
+  secondary_output:
+    type: object
+    description: "Optional secondary resource produced at a lower rate."
+    properties:
+      resource:
+        type: string
+      rate_fraction:
+        type: number
+        minimum: 0.0
+        maximum: 1.0
+        description: "Fraction of base_output_per_hour for the secondary resource."
+    additionalProperties: false
+
+  base_output_per_hour:
+    type: number
+    minimum: 0.0
+    description: >
+      Base resource units generated per assigned character per hour.
+      Actual output = base * suitability_multiplier * character_level_factor.
+      Level factor formula: (level / max_level) ^ 0.5 — tunable in constants.yaml.
+
+  max_slots:
+    type: integer
+    minimum: 1
+    maximum: 10
+    description: "Maximum number of characters that can be simultaneously assigned to this job."
+
+  unlock_condition:
+    type: object
+    description: "What the player must have done before this job slot is available."
+    properties:
+      building_level:
+        type: integer
+        minimum: 0
+        description: "Village building level required to unlock this slot."
+      prerequisite_job_id:
+        type: string
+        description: "Another job that must be unlocked first."
+    additionalProperties: false
+
+  manual_work_eligible:
+    type: boolean
+    default: false
+    description: >
+      If true, this job can be targeted by the manual micro-management action.
+      Only one or two jobs should have this enabled in PoC to keep the system focused.
+
+  passive_cap_hours:
+    type: number
+    minimum: 1.0
+    default: 8.0
+    description: >
+      Hours after which passive accumulation stops until the player collects.
+      Prevents long absences from breaking the economy. Default is 8 hours
+      matching the server-side MAX_PASSIVE_HOURS constant.