Add story-graph narrative system (campaigns, editors, runtime)

Introduce the narrative layer as a directed story-flow graph: an authored
campaign a player walks node by node, replacing the interim slot/chapter model.

Schema (migrations 015-021):
- mysteries, global NPC templates + named poses, per-user playthroughs
- story_nodes, terminals, utterances (the flow graph and dialogue trees)
- clean cutover: retire slot cutscenes/chapters/seen_dialogue

Runtime:
- New Game creates a playthrough bound to the JWT identity (dev test-user fallback)
- advance() walks the graph cutscene -> dialogue -> level -> ..., auto-skipping gates
- branching dialogue: player choices route out through node terminals

Admin authoring:
- NPC editor: upload named poses to the gupi MinIO bucket
- mystery graph editor: vertical node canvas, wiring, entrypoint, delete-by-click
- dialogue crafter: utterance tree, Tab to add child, 1/2 speaker, undo

Content authored via the manifest importer / admin panel and seeded for Glass
Harbour. MinIO added to the dev stack; dev container runs in development mode.

Also includes a folder-widget simplification (removes open/close) and a
resolveUserId auth helper.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

migrations/019_utterances.sql

@@ -0,0 +1,25 @@
+-- Utterances: the content of a dialogue node (and utterance-bearing cutscenes).
+-- One table for both NPC lines and player choices, distinguished by `utterer`.
+-- The intra-node conversation graph uses two self-references; `terminal_id` is the
+-- exit that leaves the node via one of its output terminals. Runtime is Phase 2.
+
+CREATE TABLE osint.utterances (
+  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+  node_id UUID NOT NULL REFERENCES osint.story_nodes(id) ON DELETE CASCADE,
+  utterer TEXT NOT NULL DEFAULT 'npc' CHECK (utterer IN ('npc','player')),
+  npc_id UUID REFERENCES osint.npcs(id),   -- speaker for NPC lines; NULL for player choices
+  pose_key TEXT,                            -- resolved with the usual pose fallback
+  text TEXT NOT NULL DEFAULT '',
+  -- Intra-node conversation graph:
+  parent_utterance_id UUID REFERENCES osint.utterances(id) ON DELETE CASCADE,       -- player options hang under the NPC prompt they answer
+  advances_to_utterance_id UUID REFERENCES osint.utterances(id) ON DELETE SET NULL, -- next line; may loop back to the same one
+  -- Inter-node exit:
+  terminal_id UUID REFERENCES osint.story_node_terminals(id) ON DELETE SET NULL,
+  effect TEXT,                              -- optional authored side-effect hook (vocabulary TBD)
+  xpos DOUBLE PRECISION NOT NULL DEFAULT 0, -- position in the node's utterance sub-canvas
+  ypos DOUBLE PRECISION NOT NULL DEFAULT 0,
+  sort_order INTEGER NOT NULL DEFAULT 0
+);
+CREATE INDEX utterances_node_idx ON osint.utterances (node_id);
+
+COMMENT ON TABLE osint.utterances IS 'Dialogue content per story node. Same-node integrity for parent/advances_to/terminal links is enforced in the repository (Phase 1).';