feat(v1.1.5): files SDK + files:* triggers

Filesystem-backed blob storage as the fifth concrete trigger kind.

- `files::collection(c).{create,head,get,update,delete,list}` Rhai SDK
  (blob in/out; metadata maps; missing-field throws naming the field).
- `FilesService` trait in picloud-shared; `FsFilesRepo` (atomic
  write: temp→fsync→rename→fsync-dir→DB; single-pass SHA-256;
  checksum-verified reads → Corrupted) + `FilesServiceImpl` in
  manager-core. Metadata in Postgres (0018), bytes on disk under
  PICLOUD_FILES_ROOT with 0o700 shard dirs.
- `files:*` trigger kind via the Layout-E pattern (0019: widen both
  CHECKs + files_trigger_details), TriggerEvent::Files (metadata only,
  no bytes), emit_files fan-out, dispatcher arm, admin endpoint
  POST /triggers/files (reuses validate_trigger_target).
- AppFilesRead/AppFilesWrite capabilities → script:read/script:write
  (seven-scope commitment held). AppPubsubPublish reserved for v1.1.6.
- Admin files API (list + delete) + dashboard Files view per app.

Cross-app isolation keyed on cx.app_id at every layer. ~45 new tests
(service in-memory, fs tempdir, bridge integration). No DB required
for the suite. publish_ephemeral and the orphan sweep stay deferred.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

crates/manager-core/src/files_api.rs

@@ -0,0 +1,215 @@
+//! `/api/v1/admin/apps/{id}/files*` — minimal files admin endpoints
+//! backing the dashboard's files view (v1.1.5).
+//!
+//! Two operations only, both operator-facing:
+//!   * `GET  /apps/{id}/files?collection=<c>&cursor=&limit=` — list file
+//!     metadata for a collection (cursor-paginated).
+//!   * `DELETE /apps/{id}/files/{collection}/{file_id}` — remove a file.
+//!
+//! These talk to the `FilesRepo` directly (like `triggers_api` talks to
+//! `TriggerRepo`), guarded by the same capability model as the SDK
+//! (`AppFilesRead` / `AppFilesWrite`). **Admin deletes do NOT emit a
+//! `files:delete` trigger event** — they're operator cleanup actions,
+//! not script mutations (see HANDBACK §7). The capability binds to the
+//! resource's `app_id` after the app is loaded.
+
+use std::sync::Arc;
+
+use axum::extract::{Path, Query, State};
+use axum::http::StatusCode;
+use axum::response::{IntoResponse, Json, Response};
+use axum::routing::{delete, get};
+use axum::{Extension, Router};
+use picloud_shared::{AppId, Principal};
+use serde::{Deserialize, Serialize};
+use serde_json::json;
+use uuid::Uuid;
+
+use crate::app_repo::AppRepository;
+use crate::authz::{require, AuthzDenied, AuthzError, AuthzRepo, Capability};
+use crate::files_repo::{FilesRepo, FilesRepoError};
+
+#[derive(Clone)]
+pub struct FilesAdminState {
+    pub files: Arc<dyn FilesRepo>,
+    pub apps: Arc<dyn AppRepository>,
+    pub authz: Arc<dyn AuthzRepo>,
+}
+
+pub fn files_admin_router(state: FilesAdminState) -> Router {
+    Router::new()
+        .route("/apps/{app_id}/files", get(list_files))
+        .route(
+            "/apps/{app_id}/files/{collection}/{file_id}",
+            delete(delete_file),
+        )
+        .with_state(state)
+}
+
+#[derive(Debug, Deserialize)]
+pub struct ListFilesQuery {
+    pub collection: String,
+    #[serde(default)]
+    pub cursor: Option<String>,
+    #[serde(default)]
+    pub limit: Option<u32>,
+}
+
+#[derive(Debug, Serialize)]
+struct FileMetaDto {
+    id: String,
+    collection: String,
+    name: String,
+    content_type: String,
+    size: u64,
+    checksum: String,
+    created_at: String,
+    updated_at: String,
+}
+
+#[derive(Debug, Serialize)]
+struct ListFilesResponse {
+    files: Vec<FileMetaDto>,
+    next_cursor: Option<String>,
+}
+
+async fn list_files(
+    State(s): State<FilesAdminState>,
+    Extension(principal): Extension<Principal>,
+    Path(app_id): Path<AppId>,
+    Query(q): Query<ListFilesQuery>,
+) -> Result<Json<ListFilesResponse>, FilesApiError> {
+    ensure_app_exists(&*s.apps, app_id).await?;
+    require(
+        s.authz.as_ref(),
+        &principal,
+        Capability::AppFilesRead(app_id),
+    )
+    .await?;
+    if q.collection.trim().is_empty() {
+        return Err(FilesApiError::Invalid(
+            "collection must not be empty".into(),
+        ));
+    }
+    let page = s
+        .files
+        .list(
+            app_id,
+            &q.collection,
+            q.cursor.as_deref(),
+            q.limit.unwrap_or(0),
+        )
+        .await?;
+    let files = page
+        .files
+        .into_iter()
+        .map(|m| FileMetaDto {
+            id: m.id.to_string(),
+            collection: m.collection,
+            name: m.name,
+            content_type: m.content_type,
+            size: m.size,
+            checksum: m.checksum,
+            created_at: m.created_at.to_rfc3339(),
+            updated_at: m.updated_at.to_rfc3339(),
+        })
+        .collect();
+    Ok(Json(ListFilesResponse {
+        files,
+        next_cursor: page.next_cursor,
+    }))
+}
+
+async fn delete_file(
+    State(s): State<FilesAdminState>,
+    Extension(principal): Extension<Principal>,
+    Path((app_id, collection, file_id)): Path<(AppId, String, String)>,
+) -> Result<StatusCode, FilesApiError> {
+    ensure_app_exists(&*s.apps, app_id).await?;
+    require(
+        s.authz.as_ref(),
+        &principal,
+        Capability::AppFilesWrite(app_id),
+    )
+    .await?;
+    let id = Uuid::parse_str(&file_id).map_err(|_| FilesApiError::NotFound)?;
+    if s.files.delete(app_id, &collection, id).await?.is_none() {
+        return Err(FilesApiError::NotFound);
+    }
+    Ok(StatusCode::NO_CONTENT)
+}
+
+async fn ensure_app_exists(apps: &dyn AppRepository, app_id: AppId) -> Result<(), FilesApiError> {
+    apps.get_by_id(app_id)
+        .await
+        .map_err(|e| FilesApiError::Backend(e.to_string()))?
+        .ok_or(FilesApiError::AppNotFound)?;
+    Ok(())
+}
+
+#[derive(Debug, thiserror::Error)]
+pub enum FilesApiError {
+    #[error("app not found")]
+    AppNotFound,
+    #[error("file not found")]
+    NotFound,
+    #[error("invalid request: {0}")]
+    Invalid(String),
+    #[error("forbidden")]
+    Forbidden,
+    #[error("authorization repo error: {0}")]
+    AuthzRepo(String),
+    #[error("files backend: {0}")]
+    Backend(String),
+}
+
+impl From<AuthzDenied> for FilesApiError {
+    fn from(d: AuthzDenied) -> Self {
+        match d {
+            AuthzDenied::Denied => Self::Forbidden,
+            AuthzDenied::Repo(e) => Self::AuthzRepo(e.to_string()),
+        }
+    }
+}
+
+impl From<AuthzError> for FilesApiError {
+    fn from(e: AuthzError) -> Self {
+        Self::AuthzRepo(e.to_string())
+    }
+}
+
+impl From<FilesRepoError> for FilesApiError {
+    fn from(e: FilesRepoError) -> Self {
+        Self::Backend(e.to_string())
+    }
+}
+
+impl IntoResponse for FilesApiError {
+    fn into_response(self) -> Response {
+        let (status, body) = match &self {
+            Self::AppNotFound | Self::NotFound => {
+                (StatusCode::NOT_FOUND, json!({ "error": self.to_string() }))
+            }
+            Self::Invalid(_) => (
+                StatusCode::UNPROCESSABLE_ENTITY,
+                json!({ "error": self.to_string() }),
+            ),
+            Self::Forbidden => (StatusCode::FORBIDDEN, json!({ "error": self.to_string() })),
+            Self::AuthzRepo(e) => {
+                tracing::error!(error = %e, "files admin authz repo error");
+                (
+                    StatusCode::INTERNAL_SERVER_ERROR,
+                    json!({ "error": "internal error" }),
+                )
+            }
+            Self::Backend(e) => {
+                tracing::error!(error = %e, "files admin backend error");
+                (
+                    StatusCode::INTERNAL_SERVER_ERROR,
+                    json!({ "error": "internal error" }),
+                )
+            }
+        };
+        (status, Json(body)).into_response()
+    }
+}