feat(sources): strukturierte Klassifikation (Politik/Medientyp/Reliability/Alignments)

- Neue sources-Spalten: political_orientation (7+2 Stufen), media_type (20),
  reliability (5+1), state_affiliated, country_code, classification_source,
  classified_at sowie proposed_*-Spalten fuer LLM-Vorschlaege.
- Neue source_alignments-Tabelle fuer Mehrfach-Tagging geopolitischer Naehe
  (prorussisch, proiranisch, prowestlich, ...).
- API-Filter: ?political_orientation, ?media_type, ?reliability,
  ?state_affiliated, ?alignment.
- create/update_source nehmen alignments[] entgegen und setzen
  classification_source automatisch auf 'manual' bei Klassifikations-Edits.

Backwards-kompatibel: bestehendes bias/language/category bleibt unveraendert,
Default fuer Bestandsquellen ist classification_source = 'legacy'.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/models.py

@@ -139,24 +139,51 @@ class IncidentListItem(BaseModel):
 
 
 # Sources (Quellenverwaltung)
+SOURCE_TYPE_PATTERN = "^(rss_feed|web_source|excluded|telegram_channel|podcast_feed)$"
+SOURCE_CATEGORY_PATTERN = "^(nachrichtenagentur|oeffentlich-rechtlich|qualitaetszeitung|behoerde|fachmedien|think-tank|international|regional|boulevard|sonstige)$"
+SOURCE_STATUS_PATTERN = "^(active|inactive)$"
+POLITICAL_ORIENTATION_PATTERN = "^(links_extrem|links|mitte_links|liberal|mitte|konservativ|mitte_rechts|rechts|rechts_extrem|na)$"
+MEDIA_TYPE_PATTERN = "^(tageszeitung|wochenzeitung|magazin|tv_sender|radio|oeffentlich_rechtlich|nachrichtenagentur|online_only|blog|telegram_kanal|telegram_bot|podcast|social_media|imageboard|think_tank|ngo|behoerde|staatsmedium|fachmedium|sonstige)$"
+RELIABILITY_PATTERN = "^(sehr_hoch|hoch|gemischt|niedrig|sehr_niedrig|na)$"
+ALIGNMENT_PATTERN = "^(prorussisch|proiranisch|prowestlich|proukrainisch|prochinesisch|projapanisch|proisraelisch|propalaestinensisch|protuerkisch|panarabisch|neutral|sonstige)$"
+COUNTRY_CODE_PATTERN = "^[A-Z]{2}$"
+CLASSIFICATION_SOURCE_PATTERN = "^(manual|llm_approved|llm_pending|legacy)$"
+
+
 class SourceCreate(BaseModel):
     name: str = Field(min_length=1, max_length=200)
     url: Optional[str] = None
     domain: Optional[str] = None
-    source_type: str = Field(default="rss_feed", pattern="^(rss_feed|web_source|excluded|telegram_channel|podcast_feed)$")
-    category: str = Field(default="sonstige", pattern="^(nachrichtenagentur|oeffentlich-rechtlich|qualitaetszeitung|behoerde|fachmedien|think-tank|international|regional|boulevard|sonstige)$")
-    status: str = Field(default="active", pattern="^(active|inactive)$")
+    source_type: str = Field(default="rss_feed", pattern=SOURCE_TYPE_PATTERN)
+    category: str = Field(default="sonstige", pattern=SOURCE_CATEGORY_PATTERN)
+    status: str = Field(default="active", pattern=SOURCE_STATUS_PATTERN)
     notes: Optional[str] = None
+    language: Optional[str] = None
+    bias: Optional[str] = None
+    political_orientation: Optional[str] = Field(default=None, pattern=POLITICAL_ORIENTATION_PATTERN)
+    media_type: Optional[str] = Field(default=None, pattern=MEDIA_TYPE_PATTERN)
+    reliability: Optional[str] = Field(default=None, pattern=RELIABILITY_PATTERN)
+    state_affiliated: Optional[bool] = None
+    country_code: Optional[str] = Field(default=None, pattern=COUNTRY_CODE_PATTERN)
+    alignments: Optional[list[str]] = None
 
 
 class SourceUpdate(BaseModel):
     name: Optional[str] = Field(default=None, max_length=200)
     url: Optional[str] = None
     domain: Optional[str] = None
-    source_type: Optional[str] = Field(default=None, pattern="^(rss_feed|web_source|excluded|telegram_channel|podcast_feed)$")
-    category: Optional[str] = Field(default=None, pattern="^(nachrichtenagentur|oeffentlich-rechtlich|qualitaetszeitung|behoerde|fachmedien|think-tank|international|regional|boulevard|sonstige)$")
-    status: Optional[str] = Field(default=None, pattern="^(active|inactive)$")
+    source_type: Optional[str] = Field(default=None, pattern=SOURCE_TYPE_PATTERN)
+    category: Optional[str] = Field(default=None, pattern=SOURCE_CATEGORY_PATTERN)
+    status: Optional[str] = Field(default=None, pattern=SOURCE_STATUS_PATTERN)
     notes: Optional[str] = None
+    language: Optional[str] = None
+    bias: Optional[str] = None
+    political_orientation: Optional[str] = Field(default=None, pattern=POLITICAL_ORIENTATION_PATTERN)
+    media_type: Optional[str] = Field(default=None, pattern=MEDIA_TYPE_PATTERN)
+    reliability: Optional[str] = Field(default=None, pattern=RELIABILITY_PATTERN)
+    state_affiliated: Optional[bool] = None
+    country_code: Optional[str] = Field(default=None, pattern=COUNTRY_CODE_PATTERN)
+    alignments: Optional[list[str]] = None
 
 
 class SourceResponse(BaseModel):
@@ -174,6 +201,14 @@ class SourceResponse(BaseModel):
     created_at: str
     language: Optional[str] = None
     bias: Optional[str] = None
+    political_orientation: Optional[str] = None
+    media_type: Optional[str] = None
+    reliability: Optional[str] = None
+    state_affiliated: bool = False
+    country_code: Optional[str] = None
+    classification_source: Optional[str] = None
+    classified_at: Optional[str] = None
+    alignments: list[str] = []
     is_global: bool = False