Added fediverse bridge draft

roles/web-app-bridgy-fed/templates/Administration.md.j2

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+# Administration
+
+## Local dev shell (inside container)
+```bash
+docker compose exec application bash
+```
+
+## Logs
+```bash
+docker compose logs -f application
+docker compose logs -f emulator   # if enabled
+```
+
+## Notes
+- Upstream dev run example:
+  ```bash
+  export APPVIEW_HOST=api.bsky.app PLC_HOST=plc.directory BGS_HOST=bsky.network PDS_HOST=atproto.brid.gy
+  flask --debug run -p 8080
+  ```
+  (We run via gunicorn in this role.)

roles/web-app-bridgy-fed/templates/docker-compose.yml.j2

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+{% include 'roles/docker-compose/templates/base.yml.j2' %}
+
+  application:
+    build:
+      context: .
+      dockerfile: Dockerfile
+      args:
+        BRIDGY_REPO_URL: "{{ BRIDGY_REPO_URL }}"
+        BRIDGY_REPO_REF: "{{ BRIDGY_REPO_REF }}"
+        CONTAINER_PORT:  "{{ container_port | string }}"
+    image: "{{ BRIDGY_IMAGE }}"
+    container_name: "{{ BRIDGY_CONTAINER }}"
+    hostname: "{{ container_hostname }}"
+    env_file:
+      - "{{ docker_compose.files.env }}"
+    ports:
+      - "127.0.0.1:{{ ports.localhost.http[application_id] }}:{{ container_port }}"
+{% include 'roles/docker-container/templates/healthcheck/tcp.yml.j2' %}
+{% include 'roles/docker-container/templates/base.yml.j2' %}
+    depends_on:
+{% if EMULATOR_ENABLED | bool %}
+      - emulator
+{% endif %}
+{% include 'roles/docker-container/templates/networks.yml.j2' %}
+
+{% if EMULATOR_ENABLED | bool %}
+  emulator:
+    image: "{{ EMULATOR_IMAGE }}"
+    container_name: "{{ BRIDGY_CONTAINER }}_emulator"
+    command: >
+      gcloud emulators firestore start
+      --host-port=0.0.0.0:{{ EMULATOR_PORT }}
+      --database-mode=datastore-mode
+      --quiet
+    ports:
+      - "127.0.0.1:{{ EMULATOR_PORT }}:{{ EMULATOR_PORT }}"
+    environment:
+      - CLOUDSDK_CORE_DISABLE_PROMPTS=1
+    restart: unless-stopped
+{% include 'roles/docker-container/templates/networks.yml.j2' %}
+{% endif %}
+
+{% include 'roles/docker-compose/templates/networks.yml.j2' %}

roles/web-app-bridgy-fed/templates/env.j2

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+# Flask / Gunicorn basics
+FLASK_ENV="{{ ENVIRONMENT | default('production') }}"
+PORT="{{ container_port }}"
+BRIDGY_ADMIN_EMAIL="{{ BRIDGY_ADMIN_EMAIL }}"
+
+# Bridgy Fed upstream knobs (see README @ GitHub)
+APPVIEW_HOST="{{ APPVIEW_HOST }}"
+PLC_HOST="{{ PLC_HOST }}"
+BGS_HOST="{{ BGS_HOST }}"
+PDS_HOST="{{ PDS_HOST }}"
+
+# Datastore emulator (Datastore-mode Firestore). If sidecar enabled, point here.
+GOOGLE_CLOUD_PROJECT="{{ EMULATOR_PROJECT_ID }}"
+DATASTORE_EMULATOR_HOST="{{ EMULATOR_ENABLED | ternary(EMULATOR_HOST_INTERNAL, '') }}"
+# DATASTORE_DATASET not needed when GOOGLE_CLOUD_PROJECT is set
+
+# Optional:
+# GUNICORN_CMD_ARGS="--log-level info"